Pileus Git - ~andy/linux/blob - net/batman-adv/translation-table.c

   1 /* Copyright (C) 2007-2014 B.A.T.M.A.N. contributors:
   2  *
   3  * Marek Lindner, Simon Wunderlich, Antonio Quartulli
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of version 2 of the GNU General Public
   7  * License as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  12  * General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include "main.h"
  19 #include "translation-table.h"
  20 #include "soft-interface.h"
  21 #include "hard-interface.h"
  22 #include "send.h"
  23 #include "hash.h"
  24 #include "originator.h"
  25 #include "routing.h"
  26 #include "bridge_loop_avoidance.h"
  27
  28 #include <linux/crc32c.h>
  29
  30 /* hash class keys */
  31 static struct lock_class_key batadv_tt_local_hash_lock_class_key;
  32 static struct lock_class_key batadv_tt_global_hash_lock_class_key;
  33
  34 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
  35                                  unsigned short vid,
  36                                  struct batadv_orig_node *orig_node);
  37 static void batadv_tt_purge(struct work_struct *work);
  38 static void
  39 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry);
  40 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
  41                                  struct batadv_orig_node *orig_node,
  42                                  const unsigned char *addr,
  43                                  unsigned short vid, const char *message,
  44                                  bool roaming);
  45
  46 /* returns 1 if they are the same mac addr */
  47 static int batadv_compare_tt(const struct hlist_node *node, const void *data2)
  48 {
  49         const void *data1 = container_of(node, struct batadv_tt_common_entry,
  50                                          hash_entry);
  51
  52         return batadv_compare_eth(data1, data2);
  53 }
  54
  55 /**
  56  * batadv_choose_tt - return the index of the tt entry in the hash table
  57  * @data: pointer to the tt_common_entry object to map
  58  * @size: the size of the hash table
  59  *
  60  * Returns the hash index where the object represented by 'data' should be
  61  * stored at.
  62  */
  63 static inline uint32_t batadv_choose_tt(const void *data, uint32_t size)
  64 {
  65         struct batadv_tt_common_entry *tt;
  66         uint32_t hash = 0;
  67
  68         tt = (struct batadv_tt_common_entry *)data;
  69         hash = batadv_hash_bytes(hash, &tt->addr, ETH_ALEN);
  70         hash = batadv_hash_bytes(hash, &tt->vid, sizeof(tt->vid));
  71
  72         hash += (hash << 3);
  73         hash ^= (hash >> 11);
  74         hash += (hash << 15);
  75
  76         return hash % size;
  77 }
  78
  79 /**
  80  * batadv_tt_hash_find - look for a client in the given hash table
  81  * @hash: the hash table to search
  82  * @addr: the mac address of the client to look for
  83  * @vid: VLAN identifier
  84  *
  85  * Returns a pointer to the tt_common struct belonging to the searched client if
  86  * found, NULL otherwise.
  87  */
  88 static struct batadv_tt_common_entry *
  89 batadv_tt_hash_find(struct batadv_hashtable *hash, const uint8_t *addr,
  90                     unsigned short vid)
  91 {
  92         struct hlist_head *head;
  93         struct batadv_tt_common_entry to_search, *tt, *tt_tmp = NULL;
  94         uint32_t index;
  95
  96         if (!hash)
  97                 return NULL;
  98
  99         memcpy(to_search.addr, addr, ETH_ALEN);
 100         to_search.vid = vid;
 101
 102         index = batadv_choose_tt(&to_search, hash->size);
 103         head = &hash->table[index];
 104
 105         rcu_read_lock();
 106         hlist_for_each_entry_rcu(tt, head, hash_entry) {
 107                 if (!batadv_compare_eth(tt, addr))
 108                         continue;
 109
 110                 if (tt->vid != vid)
 111                         continue;
 112
 113                 if (!atomic_inc_not_zero(&tt->refcount))
 114                         continue;
 115
 116                 tt_tmp = tt;
 117                 break;
 118         }
 119         rcu_read_unlock();
 120
 121         return tt_tmp;
 122 }
 123
 124 /**
 125  * batadv_tt_local_hash_find - search the local table for a given client
 126  * @bat_priv: the bat priv with all the soft interface information
 127  * @addr: the mac address of the client to look for
 128  * @vid: VLAN identifier
 129  *
 130  * Returns a pointer to the corresponding tt_local_entry struct if the client is
 131  * found, NULL otherwise.
 132  */
 133 static struct batadv_tt_local_entry *
 134 batadv_tt_local_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 135                           unsigned short vid)
 136 {
 137         struct batadv_tt_common_entry *tt_common_entry;
 138         struct batadv_tt_local_entry *tt_local_entry = NULL;
 139
 140         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.local_hash, addr,
 141                                               vid);
 142         if (tt_common_entry)
 143                 tt_local_entry = container_of(tt_common_entry,
 144                                               struct batadv_tt_local_entry,
 145                                               common);
 146         return tt_local_entry;
 147 }
 148
 149 /**
 150  * batadv_tt_global_hash_find - search the global table for a given client
 151  * @bat_priv: the bat priv with all the soft interface information
 152  * @addr: the mac address of the client to look for
 153  * @vid: VLAN identifier
 154  *
 155  * Returns a pointer to the corresponding tt_global_entry struct if the client
 156  * is found, NULL otherwise.
 157  */
 158 static struct batadv_tt_global_entry *
 159 batadv_tt_global_hash_find(struct batadv_priv *bat_priv, const uint8_t *addr,
 160                            unsigned short vid)
 161 {
 162         struct batadv_tt_common_entry *tt_common_entry;
 163         struct batadv_tt_global_entry *tt_global_entry = NULL;
 164
 165         tt_common_entry = batadv_tt_hash_find(bat_priv->tt.global_hash, addr,
 166                                               vid);
 167         if (tt_common_entry)
 168                 tt_global_entry = container_of(tt_common_entry,
 169                                                struct batadv_tt_global_entry,
 170                                                common);
 171         return tt_global_entry;
 172 }
 173
 174 static void
 175 batadv_tt_local_entry_free_ref(struct batadv_tt_local_entry *tt_local_entry)
 176 {
 177         if (atomic_dec_and_test(&tt_local_entry->common.refcount))
 178                 kfree_rcu(tt_local_entry, common.rcu);
 179 }
 180
 181 /**
 182  * batadv_tt_global_entry_free_ref - decrement the refcounter for a
 183  *  tt_global_entry and possibly free it
 184  * @tt_global_entry: the object to free
 185  */
 186 static void
 187 batadv_tt_global_entry_free_ref(struct batadv_tt_global_entry *tt_global_entry)
 188 {
 189         if (atomic_dec_and_test(&tt_global_entry->common.refcount)) {
 190                 batadv_tt_global_del_orig_list(tt_global_entry);
 191                 kfree_rcu(tt_global_entry, common.rcu);
 192         }
 193 }
 194
 195 static void batadv_tt_orig_list_entry_free_rcu(struct rcu_head *rcu)
 196 {
 197         struct batadv_tt_orig_list_entry *orig_entry;
 198
 199         orig_entry = container_of(rcu, struct batadv_tt_orig_list_entry, rcu);
 200
 201         /* We are in an rcu callback here, therefore we cannot use
 202          * batadv_orig_node_free_ref() and its call_rcu():
 203          * An rcu_barrier() wouldn't wait for that to finish
 204          */
 205         batadv_orig_node_free_ref_now(orig_entry->orig_node);
 206         kfree(orig_entry);
 207 }
 208
 209 /**
 210  * batadv_tt_local_size_mod - change the size by v of the local table identified
 211  *  by vid
 212  * @bat_priv: the bat priv with all the soft interface information
 213  * @vid: the VLAN identifier of the sub-table to change
 214  * @v: the amount to sum to the local table size
 215  */
 216 static void batadv_tt_local_size_mod(struct batadv_priv *bat_priv,
 217                                      unsigned short vid, int v)
 218 {
 219         struct batadv_softif_vlan *vlan;
 220
 221         vlan = batadv_softif_vlan_get(bat_priv, vid);
 222         if (!vlan)
 223                 return;
 224
 225         atomic_add(v, &vlan->tt.num_entries);
 226
 227         batadv_softif_vlan_free_ref(vlan);
 228 }
 229
 230 /**
 231  * batadv_tt_local_size_inc - increase by one the local table size for the given
 232  *  vid
 233  * @bat_priv: the bat priv with all the soft interface information
 234  * @vid: the VLAN identifier
 235  */
 236 static void batadv_tt_local_size_inc(struct batadv_priv *bat_priv,
 237                                      unsigned short vid)
 238 {
 239         batadv_tt_local_size_mod(bat_priv, vid, 1);
 240 }
 241
 242 /**
 243  * batadv_tt_local_size_dec - decrease by one the local table size for the given
 244  *  vid
 245  * @bat_priv: the bat priv with all the soft interface information
 246  * @vid: the VLAN identifier
 247  */
 248 static void batadv_tt_local_size_dec(struct batadv_priv *bat_priv,
 249                                      unsigned short vid)
 250 {
 251         batadv_tt_local_size_mod(bat_priv, vid, -1);
 252 }
 253
 254 /**
 255  * batadv_tt_global_size_mod - change the size by v of the local table
 256  *  identified by vid
 257  * @bat_priv: the bat priv with all the soft interface information
 258  * @vid: the VLAN identifier
 259  * @v: the amount to sum to the global table size
 260  */
 261 static void batadv_tt_global_size_mod(struct batadv_orig_node *orig_node,
 262                                       unsigned short vid, int v)
 263 {
 264         struct batadv_orig_node_vlan *vlan;
 265
 266         vlan = batadv_orig_node_vlan_new(orig_node, vid);
 267         if (!vlan)
 268                 return;
 269
 270         if (atomic_add_return(v, &vlan->tt.num_entries) == 0) {
 271                 spin_lock_bh(&orig_node->vlan_list_lock);
 272                 list_del_rcu(&vlan->list);
 273                 spin_unlock_bh(&orig_node->vlan_list_lock);
 274                 batadv_orig_node_vlan_free_ref(vlan);
 275         }
 276
 277         batadv_orig_node_vlan_free_ref(vlan);
 278 }
 279
 280 /**
 281  * batadv_tt_global_size_inc - increase by one the global table size for the
 282  *  given vid
 283  * @orig_node: the originator which global table size has to be decreased
 284  * @vid: the vlan identifier
 285  */
 286 static void batadv_tt_global_size_inc(struct batadv_orig_node *orig_node,
 287                                       unsigned short vid)
 288 {
 289         batadv_tt_global_size_mod(orig_node, vid, 1);
 290 }
 291
 292 /**
 293  * batadv_tt_global_size_dec - decrease by one the global table size for the
 294  *  given vid
 295  * @orig_node: the originator which global table size has to be decreased
 296  * @vid: the vlan identifier
 297  */
 298 static void batadv_tt_global_size_dec(struct batadv_orig_node *orig_node,
 299                                       unsigned short vid)
 300 {
 301         batadv_tt_global_size_mod(orig_node, vid, -1);
 302 }
 303
 304 static void
 305 batadv_tt_orig_list_entry_free_ref(struct batadv_tt_orig_list_entry *orig_entry)
 306 {
 307         if (!atomic_dec_and_test(&orig_entry->refcount))
 308                 return;
 309
 310         call_rcu(&orig_entry->rcu, batadv_tt_orig_list_entry_free_rcu);
 311 }
 312
 313 /**
 314  * batadv_tt_local_event - store a local TT event (ADD/DEL)
 315  * @bat_priv: the bat priv with all the soft interface information
 316  * @tt_local_entry: the TT entry involved in the event
 317  * @event_flags: flags to store in the event structure
 318  */
 319 static void batadv_tt_local_event(struct batadv_priv *bat_priv,
 320                                   struct batadv_tt_local_entry *tt_local_entry,
 321                                   uint8_t event_flags)
 322 {
 323         struct batadv_tt_change_node *tt_change_node, *entry, *safe;
 324         struct batadv_tt_common_entry *common = &tt_local_entry->common;
 325         uint8_t flags = common->flags | event_flags;
 326         bool event_removed = false;
 327         bool del_op_requested, del_op_entry;
 328
 329         tt_change_node = kmalloc(sizeof(*tt_change_node), GFP_ATOMIC);
 330         if (!tt_change_node)
 331                 return;
 332
 333         tt_change_node->change.flags = flags;
 334         memset(tt_change_node->change.reserved, 0,
 335                sizeof(tt_change_node->change.reserved));
 336         memcpy(tt_change_node->change.addr, common->addr, ETH_ALEN);
 337         tt_change_node->change.vid = htons(common->vid);
 338
 339         del_op_requested = flags & BATADV_TT_CLIENT_DEL;
 340
 341         /* check for ADD+DEL or DEL+ADD events */
 342         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 343         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 344                                  list) {
 345                 if (!batadv_compare_eth(entry->change.addr, common->addr))
 346                         continue;
 347
 348                 /* DEL+ADD in the same orig interval have no effect and can be
 349                  * removed to avoid silly behaviour on the receiver side. The
 350                  * other way around (ADD+DEL) can happen in case of roaming of
 351                  * a client still in the NEW state. Roaming of NEW clients is
 352                  * now possible due to automatically recognition of "temporary"
 353                  * clients
 354                  */
 355                 del_op_entry = entry->change.flags & BATADV_TT_CLIENT_DEL;
 356                 if (!del_op_requested && del_op_entry)
 357                         goto del;
 358                 if (del_op_requested && !del_op_entry)
 359                         goto del;
 360
 361                 /* this is a second add in the same originator interval. It
 362                  * means that flags have been changed: update them!
 363                  */
 364                 if (!del_op_requested && !del_op_entry)
 365                         entry->change.flags = flags;
 366
 367                 continue;
 368 del:
 369                 list_del(&entry->list);
 370                 kfree(entry);
 371                 kfree(tt_change_node);
 372                 event_removed = true;
 373                 goto unlock;
 374         }
 375
 376         /* track the change in the OGMinterval list */
 377         list_add_tail(&tt_change_node->list, &bat_priv->tt.changes_list);
 378
 379 unlock:
 380         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 381
 382         if (event_removed)
 383                 atomic_dec(&bat_priv->tt.local_changes);
 384         else
 385                 atomic_inc(&bat_priv->tt.local_changes);
 386 }
 387
 388 /**
 389  * batadv_tt_len - compute length in bytes of given number of tt changes
 390  * @changes_num: number of tt changes
 391  *
 392  * Returns computed length in bytes.
 393  */
 394 static int batadv_tt_len(int changes_num)
 395 {
 396         return changes_num * sizeof(struct batadv_tvlv_tt_change);
 397 }
 398
 399 /**
 400  * batadv_tt_entries - compute the number of entries fitting in tt_len bytes
 401  * @tt_len: available space
 402  *
 403  * Returns the number of entries.
 404  */
 405 static uint16_t batadv_tt_entries(uint16_t tt_len)
 406 {
 407         return tt_len / batadv_tt_len(1);
 408 }
 409
 410 /**
 411  * batadv_tt_local_table_transmit_size - calculates the local translation table
 412  *  size when transmitted over the air
 413  * @bat_priv: the bat priv with all the soft interface information
 414  *
 415  * Returns local translation table size in bytes.
 416  */
 417 static int batadv_tt_local_table_transmit_size(struct batadv_priv *bat_priv)
 418 {
 419         uint16_t num_vlan = 0, tt_local_entries = 0;
 420         struct batadv_softif_vlan *vlan;
 421         int hdr_size;
 422
 423         rcu_read_lock();
 424         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 425                 num_vlan++;
 426                 tt_local_entries += atomic_read(&vlan->tt.num_entries);
 427         }
 428         rcu_read_unlock();
 429
 430         /* header size of tvlv encapsulated tt response payload */
 431         hdr_size = sizeof(struct batadv_unicast_tvlv_packet);
 432         hdr_size += sizeof(struct batadv_tvlv_hdr);
 433         hdr_size += sizeof(struct batadv_tvlv_tt_data);
 434         hdr_size += num_vlan * sizeof(struct batadv_tvlv_tt_vlan_data);
 435
 436         return hdr_size + batadv_tt_len(tt_local_entries);
 437 }
 438
 439 static int batadv_tt_local_init(struct batadv_priv *bat_priv)
 440 {
 441         if (bat_priv->tt.local_hash)
 442                 return 0;
 443
 444         bat_priv->tt.local_hash = batadv_hash_new(1024);
 445
 446         if (!bat_priv->tt.local_hash)
 447                 return -ENOMEM;
 448
 449         batadv_hash_set_lock_class(bat_priv->tt.local_hash,
 450                                    &batadv_tt_local_hash_lock_class_key);
 451
 452         return 0;
 453 }
 454
 455 static void batadv_tt_global_free(struct batadv_priv *bat_priv,
 456                                   struct batadv_tt_global_entry *tt_global,
 457                                   const char *message)
 458 {
 459         batadv_dbg(BATADV_DBG_TT, bat_priv,
 460                    "Deleting global tt entry %pM (vid: %d): %s\n",
 461                    tt_global->common.addr,
 462                    BATADV_PRINT_VID(tt_global->common.vid), message);
 463
 464         batadv_hash_remove(bat_priv->tt.global_hash, batadv_compare_tt,
 465                            batadv_choose_tt, &tt_global->common);
 466         batadv_tt_global_entry_free_ref(tt_global);
 467 }
 468
 469 /**
 470  * batadv_tt_local_add - add a new client to the local table or update an
 471  *  existing client
 472  * @soft_iface: netdev struct of the mesh interface
 473  * @addr: the mac address of the client to add
 474  * @vid: VLAN identifier
 475  * @ifindex: index of the interface where the client is connected to (useful to
 476  *  identify wireless clients)
 477  * @mark: the value contained in the skb->mark field of the received packet (if
 478  *  any)
 479  *
 480  * Returns true if the client was successfully added, false otherwise.
 481  */
 482 bool batadv_tt_local_add(struct net_device *soft_iface, const uint8_t *addr,
 483                          unsigned short vid, int ifindex, uint32_t mark)
 484 {
 485         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
 486         struct batadv_tt_local_entry *tt_local;
 487         struct batadv_tt_global_entry *tt_global;
 488         struct net_device *in_dev = NULL;
 489         struct hlist_head *head;
 490         struct batadv_tt_orig_list_entry *orig_entry;
 491         int hash_added, table_size, packet_size_max;
 492         bool ret = false, roamed_back = false;
 493         uint8_t remote_flags;
 494         uint32_t match_mark;
 495
 496         if (ifindex != BATADV_NULL_IFINDEX)
 497                 in_dev = dev_get_by_index(&init_net, ifindex);
 498
 499         tt_local = batadv_tt_local_hash_find(bat_priv, addr, vid);
 500         tt_global = batadv_tt_global_hash_find(bat_priv, addr, vid);
 501
 502         if (tt_local) {
 503                 tt_local->last_seen = jiffies;
 504                 if (tt_local->common.flags & BATADV_TT_CLIENT_PENDING) {
 505                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 506                                    "Re-adding pending client %pM (vid: %d)\n",
 507                                    addr, BATADV_PRINT_VID(vid));
 508                         /* whatever the reason why the PENDING flag was set,
 509                          * this is a client which was enqueued to be removed in
 510                          * this orig_interval. Since it popped up again, the
 511                          * flag can be reset like it was never enqueued
 512                          */
 513                         tt_local->common.flags &= ~BATADV_TT_CLIENT_PENDING;
 514                         goto add_event;
 515                 }
 516
 517                 if (tt_local->common.flags & BATADV_TT_CLIENT_ROAM) {
 518                         batadv_dbg(BATADV_DBG_TT, bat_priv,
 519                                    "Roaming client %pM (vid: %d) came back to its original location\n",
 520                                    addr, BATADV_PRINT_VID(vid));
 521                         /* the ROAM flag is set because this client roamed away
 522                          * and the node got a roaming_advertisement message. Now
 523                          * that the client popped up again at its original
 524                          * location such flag can be unset
 525                          */
 526                         tt_local->common.flags &= ~BATADV_TT_CLIENT_ROAM;
 527                         roamed_back = true;
 528                 }
 529                 goto check_roaming;
 530         }
 531
 532         /* Ignore the client if we cannot send it in a full table response. */
 533         table_size = batadv_tt_local_table_transmit_size(bat_priv);
 534         table_size += batadv_tt_len(1);
 535         packet_size_max = atomic_read(&bat_priv->packet_size_max);
 536         if (table_size > packet_size_max) {
 537                 net_ratelimited_function(batadv_info, soft_iface,
 538                                          "Local translation table size (%i) exceeds maximum packet size (%i); Ignoring new local tt entry: %pM\n",
 539                                          table_size, packet_size_max, addr);
 540                 goto out;
 541         }
 542
 543         tt_local = kmalloc(sizeof(*tt_local), GFP_ATOMIC);
 544         if (!tt_local)
 545                 goto out;
 546
 547         batadv_dbg(BATADV_DBG_TT, bat_priv,
 548                    "Creating new local tt entry: %pM (vid: %d, ttvn: %d)\n",
 549                    addr, BATADV_PRINT_VID(vid),
 550                    (uint8_t)atomic_read(&bat_priv->tt.vn));
 551
 552         memcpy(tt_local->common.addr, addr, ETH_ALEN);
 553         /* The local entry has to be marked as NEW to avoid to send it in
 554          * a full table response going out before the next ttvn increment
 555          * (consistency check)
 556          */
 557         tt_local->common.flags = BATADV_TT_CLIENT_NEW;
 558         tt_local->common.vid = vid;
 559         if (batadv_is_wifi_netdev(in_dev))
 560                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 561         atomic_set(&tt_local->common.refcount, 2);
 562         tt_local->last_seen = jiffies;
 563         tt_local->common.added_at = tt_local->last_seen;
 564
 565         /* the batman interface mac address should never be purged */
 566         if (batadv_compare_eth(addr, soft_iface->dev_addr))
 567                 tt_local->common.flags |= BATADV_TT_CLIENT_NOPURGE;
 568
 569         hash_added = batadv_hash_add(bat_priv->tt.local_hash, batadv_compare_tt,
 570                                      batadv_choose_tt, &tt_local->common,
 571                                      &tt_local->common.hash_entry);
 572
 573         if (unlikely(hash_added != 0)) {
 574                 /* remove the reference for the hash */
 575                 batadv_tt_local_entry_free_ref(tt_local);
 576                 goto out;
 577         }
 578
 579 add_event:
 580         batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 581
 582 check_roaming:
 583         /* Check whether it is a roaming, but don't do anything if the roaming
 584          * process has already been handled
 585          */
 586         if (tt_global && !(tt_global->common.flags & BATADV_TT_CLIENT_ROAM)) {
 587                 /* These node are probably going to update their tt table */
 588                 head = &tt_global->orig_list;
 589                 rcu_read_lock();
 590                 hlist_for_each_entry_rcu(orig_entry, head, list) {
 591                         batadv_send_roam_adv(bat_priv, tt_global->common.addr,
 592                                              tt_global->common.vid,
 593                                              orig_entry->orig_node);
 594                 }
 595                 rcu_read_unlock();
 596                 if (roamed_back) {
 597                         batadv_tt_global_free(bat_priv, tt_global,
 598                                               "Roaming canceled");
 599                         tt_global = NULL;
 600                 } else {
 601                         /* The global entry has to be marked as ROAMING and
 602                          * has to be kept for consistency purpose
 603                          */
 604                         tt_global->common.flags |= BATADV_TT_CLIENT_ROAM;
 605                         tt_global->roam_at = jiffies;
 606                 }
 607         }
 608
 609         /* store the current remote flags before altering them. This helps
 610          * understanding is flags are changing or not
 611          */
 612         remote_flags = tt_local->common.flags & BATADV_TT_REMOTE_MASK;
 613
 614         if (batadv_is_wifi_netdev(in_dev))
 615                 tt_local->common.flags |= BATADV_TT_CLIENT_WIFI;
 616         else
 617                 tt_local->common.flags &= ~BATADV_TT_CLIENT_WIFI;
 618
 619         /* check the mark in the skb: if it's equal to the configured
 620          * isolation_mark, it means the packet is coming from an isolated
 621          * non-mesh client
 622          */
 623         match_mark = (mark & bat_priv->isolation_mark_mask);
 624         if (bat_priv->isolation_mark_mask &&
 625             match_mark == bat_priv->isolation_mark)
 626                 tt_local->common.flags |= BATADV_TT_CLIENT_ISOLA;
 627         else
 628                 tt_local->common.flags &= ~BATADV_TT_CLIENT_ISOLA;
 629
 630         /* if any "dynamic" flag has been modified, resend an ADD event for this
 631          * entry so that all the nodes can get the new flags
 632          */
 633         if (remote_flags ^ (tt_local->common.flags & BATADV_TT_REMOTE_MASK))
 634                 batadv_tt_local_event(bat_priv, tt_local, BATADV_NO_FLAGS);
 635
 636         ret = true;
 637 out:
 638         if (in_dev)
 639                 dev_put(in_dev);
 640         if (tt_local)
 641                 batadv_tt_local_entry_free_ref(tt_local);
 642         if (tt_global)
 643                 batadv_tt_global_entry_free_ref(tt_global);
 644         return ret;
 645 }
 646
 647 /**
 648  * batadv_tt_prepare_tvlv_global_data - prepare the TVLV TT header to send
 649  *  within a TT Response directed to another node
 650  * @orig_node: originator for which the TT data has to be prepared
 651  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 652  * @tt_change: uninitialised pointer to the address of the area where the TT
 653  *  changed can be stored
 654  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 655  *  function reserves the amount of space needed to send the entire global TT
 656  *  table. In case of success the value is updated with the real amount of
 657  *  reserved bytes
 658
 659  * Allocate the needed amount of memory for the entire TT TVLV and write its
 660  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 661  * objects, one per active VLAN served by the originator node.
 662  *
 663  * Return the size of the allocated buffer or 0 in case of failure.
 664  */
 665 static uint16_t
 666 batadv_tt_prepare_tvlv_global_data(struct batadv_orig_node *orig_node,
 667                                    struct batadv_tvlv_tt_data **tt_data,
 668                                    struct batadv_tvlv_tt_change **tt_change,
 669                                    int32_t *tt_len)
 670 {
 671         uint16_t num_vlan = 0, num_entries = 0, change_offset, tvlv_len;
 672         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 673         struct batadv_orig_node_vlan *vlan;
 674         uint8_t *tt_change_ptr;
 675
 676         rcu_read_lock();
 677         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 678                 num_vlan++;
 679                 num_entries += atomic_read(&vlan->tt.num_entries);
 680         }
 681
 682         change_offset = sizeof(**tt_data);
 683         change_offset += num_vlan * sizeof(*tt_vlan);
 684
 685         /* if tt_len is negative, allocate the space needed by the full table */
 686         if (*tt_len < 0)
 687                 *tt_len = batadv_tt_len(num_entries);
 688
 689         tvlv_len = *tt_len;
 690         tvlv_len += change_offset;
 691
 692         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 693         if (!*tt_data) {
 694                 *tt_len = 0;
 695                 goto out;
 696         }
 697
 698         (*tt_data)->flags = BATADV_NO_FLAGS;
 699         (*tt_data)->ttvn = atomic_read(&orig_node->last_ttvn);
 700         (*tt_data)->num_vlan = htons(num_vlan);
 701
 702         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 703         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
 704                 tt_vlan->vid = htons(vlan->vid);
 705                 tt_vlan->crc = htonl(vlan->tt.crc);
 706
 707                 tt_vlan++;
 708         }
 709
 710         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 711         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 712
 713 out:
 714         rcu_read_unlock();
 715         return tvlv_len;
 716 }
 717
 718 /**
 719  * batadv_tt_prepare_tvlv_local_data - allocate and prepare the TT TVLV for this
 720  *  node
 721  * @bat_priv: the bat priv with all the soft interface information
 722  * @tt_data: uninitialised pointer to the address of the TVLV buffer
 723  * @tt_change: uninitialised pointer to the address of the area where the TT
 724  *  changes can be stored
 725  * @tt_len: pointer to the length to reserve to the tt_change. if -1 this
 726  *  function reserves the amount of space needed to send the entire local TT
 727  *  table. In case of success the value is updated with the real amount of
 728  *  reserved bytes
 729  *
 730  * Allocate the needed amount of memory for the entire TT TVLV and write its
 731  * header made up by one tvlv_tt_data object and a series of tvlv_tt_vlan_data
 732  * objects, one per active VLAN.
 733  *
 734  * Return the size of the allocated buffer or 0 in case of failure.
 735  */
 736 static uint16_t
 737 batadv_tt_prepare_tvlv_local_data(struct batadv_priv *bat_priv,
 738                                   struct batadv_tvlv_tt_data **tt_data,
 739                                   struct batadv_tvlv_tt_change **tt_change,
 740                                   int32_t *tt_len)
 741 {
 742         struct batadv_tvlv_tt_vlan_data *tt_vlan;
 743         struct batadv_softif_vlan *vlan;
 744         uint16_t num_vlan = 0, num_entries = 0, tvlv_len;
 745         uint8_t *tt_change_ptr;
 746         int change_offset;
 747
 748         rcu_read_lock();
 749         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 750                 num_vlan++;
 751                 num_entries += atomic_read(&vlan->tt.num_entries);
 752         }
 753
 754         change_offset = sizeof(**tt_data);
 755         change_offset += num_vlan * sizeof(*tt_vlan);
 756
 757         /* if tt_len is negative, allocate the space needed by the full table */
 758         if (*tt_len < 0)
 759                 *tt_len = batadv_tt_len(num_entries);
 760
 761         tvlv_len = *tt_len;
 762         tvlv_len += change_offset;
 763
 764         *tt_data = kmalloc(tvlv_len, GFP_ATOMIC);
 765         if (!*tt_data) {
 766                 tvlv_len = 0;
 767                 goto out;
 768         }
 769
 770         (*tt_data)->flags = BATADV_NO_FLAGS;
 771         (*tt_data)->ttvn = atomic_read(&bat_priv->tt.vn);
 772         (*tt_data)->num_vlan = htons(num_vlan);
 773
 774         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(*tt_data + 1);
 775         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
 776                 tt_vlan->vid = htons(vlan->vid);
 777                 tt_vlan->crc = htonl(vlan->tt.crc);
 778
 779                 tt_vlan++;
 780         }
 781
 782         tt_change_ptr = (uint8_t *)*tt_data + change_offset;
 783         *tt_change = (struct batadv_tvlv_tt_change *)tt_change_ptr;
 784
 785 out:
 786         rcu_read_unlock();
 787         return tvlv_len;
 788 }
 789
 790 /**
 791  * batadv_tt_tvlv_container_update - update the translation table tvlv container
 792  *  after local tt changes have been committed
 793  * @bat_priv: the bat priv with all the soft interface information
 794  */
 795 static void batadv_tt_tvlv_container_update(struct batadv_priv *bat_priv)
 796 {
 797         struct batadv_tt_change_node *entry, *safe;
 798         struct batadv_tvlv_tt_data *tt_data;
 799         struct batadv_tvlv_tt_change *tt_change;
 800         int tt_diff_len, tt_change_len = 0;
 801         int tt_diff_entries_num = 0, tt_diff_entries_count = 0;
 802         uint16_t tvlv_len;
 803
 804         tt_diff_entries_num = atomic_read(&bat_priv->tt.local_changes);
 805         tt_diff_len = batadv_tt_len(tt_diff_entries_num);
 806
 807         /* if we have too many changes for one packet don't send any
 808          * and wait for the tt table request which will be fragmented
 809          */
 810         if (tt_diff_len > bat_priv->soft_iface->mtu)
 811                 tt_diff_len = 0;
 812
 813         tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv, &tt_data,
 814                                                      &tt_change, &tt_diff_len);
 815         if (!tvlv_len)
 816                 return;
 817
 818         tt_data->flags = BATADV_TT_OGM_DIFF;
 819
 820         if (tt_diff_len == 0)
 821                 goto container_register;
 822
 823         spin_lock_bh(&bat_priv->tt.changes_list_lock);
 824         atomic_set(&bat_priv->tt.local_changes, 0);
 825
 826         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
 827                                  list) {
 828                 if (tt_diff_entries_count < tt_diff_entries_num) {
 829                         memcpy(tt_change + tt_diff_entries_count,
 830                                &entry->change,
 831                                sizeof(struct batadv_tvlv_tt_change));
 832                         tt_diff_entries_count++;
 833                 }
 834                 list_del(&entry->list);
 835                 kfree(entry);
 836         }
 837         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
 838
 839         /* Keep the buffer for possible tt_request */
 840         spin_lock_bh(&bat_priv->tt.last_changeset_lock);
 841         kfree(bat_priv->tt.last_changeset);
 842         bat_priv->tt.last_changeset_len = 0;
 843         bat_priv->tt.last_changeset = NULL;
 844         tt_change_len = batadv_tt_len(tt_diff_entries_count);
 845         /* check whether this new OGM has no changes due to size problems */
 846         if (tt_diff_entries_count > 0) {
 847                 /* if kmalloc() fails we will reply with the full table
 848                  * instead of providing the diff
 849                  */
 850                 bat_priv->tt.last_changeset = kzalloc(tt_diff_len, GFP_ATOMIC);
 851                 if (bat_priv->tt.last_changeset) {
 852                         memcpy(bat_priv->tt.last_changeset,
 853                                tt_change, tt_change_len);
 854                         bat_priv->tt.last_changeset_len = tt_diff_len;
 855                 }
 856         }
 857         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
 858
 859 container_register:
 860         batadv_tvlv_container_register(bat_priv, BATADV_TVLV_TT, 1, tt_data,
 861                                        tvlv_len);
 862         kfree(tt_data);
 863 }
 864
 865 int batadv_tt_local_seq_print_text(struct seq_file *seq, void *offset)
 866 {
 867         struct net_device *net_dev = (struct net_device *)seq->private;
 868         struct batadv_priv *bat_priv = netdev_priv(net_dev);
 869         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
 870         struct batadv_tt_common_entry *tt_common_entry;
 871         struct batadv_tt_local_entry *tt_local;
 872         struct batadv_hard_iface *primary_if;
 873         struct batadv_softif_vlan *vlan;
 874         struct hlist_head *head;
 875         unsigned short vid;
 876         uint32_t i;
 877         int last_seen_secs;
 878         int last_seen_msecs;
 879         unsigned long last_seen_jiffies;
 880         bool no_purge;
 881         uint16_t np_flag = BATADV_TT_CLIENT_NOPURGE;
 882
 883         primary_if = batadv_seq_print_text_primary_if_get(seq);
 884         if (!primary_if)
 885                 goto out;
 886
 887         seq_printf(seq,
 888                    "Locally retrieved addresses (from %s) announced via TT (TTVN: %u):\n",
 889                    net_dev->name, (uint8_t)atomic_read(&bat_priv->tt.vn));
 890         seq_printf(seq, "       %-13s  %s %-8s %-9s (%-10s)\n", "Client", "VID",
 891                    "Flags", "Last seen", "CRC");
 892
 893         for (i = 0; i < hash->size; i++) {
 894                 head = &hash->table[i];
 895
 896                 rcu_read_lock();
 897                 hlist_for_each_entry_rcu(tt_common_entry,
 898                                          head, hash_entry) {
 899                         tt_local = container_of(tt_common_entry,
 900                                                 struct batadv_tt_local_entry,
 901                                                 common);
 902                         vid = tt_common_entry->vid;
 903                         last_seen_jiffies = jiffies - tt_local->last_seen;
 904                         last_seen_msecs = jiffies_to_msecs(last_seen_jiffies);
 905                         last_seen_secs = last_seen_msecs / 1000;
 906                         last_seen_msecs = last_seen_msecs % 1000;
 907
 908                         no_purge = tt_common_entry->flags & np_flag;
 909
 910                         vlan = batadv_softif_vlan_get(bat_priv, vid);
 911                         if (!vlan) {
 912                                 seq_printf(seq, "Cannot retrieve VLAN %d\n",
 913                                            BATADV_PRINT_VID(vid));
 914                                 continue;
 915                         }
 916
 917                         seq_printf(seq,
 918                                    " * %pM %4i [%c%c%c%c%c%c] %3u.%03u   (%#.8x)\n",
 919                                    tt_common_entry->addr,
 920                                    BATADV_PRINT_VID(tt_common_entry->vid),
 921                                    (tt_common_entry->flags &
 922                                     BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
 923                                    no_purge ? 'P' : '.',
 924                                    (tt_common_entry->flags &
 925                                     BATADV_TT_CLIENT_NEW ? 'N' : '.'),
 926                                    (tt_common_entry->flags &
 927                                     BATADV_TT_CLIENT_PENDING ? 'X' : '.'),
 928                                    (tt_common_entry->flags &
 929                                     BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
 930                                    (tt_common_entry->flags &
 931                                     BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
 932                                    no_purge ? 0 : last_seen_secs,
 933                                    no_purge ? 0 : last_seen_msecs,
 934                                    vlan->tt.crc);
 935
 936                         batadv_softif_vlan_free_ref(vlan);
 937                 }
 938                 rcu_read_unlock();
 939         }
 940 out:
 941         if (primary_if)
 942                 batadv_hardif_free_ref(primary_if);
 943         return 0;
 944 }
 945
 946 static void
 947 batadv_tt_local_set_pending(struct batadv_priv *bat_priv,
 948                             struct batadv_tt_local_entry *tt_local_entry,
 949                             uint16_t flags, const char *message)
 950 {
 951         batadv_tt_local_event(bat_priv, tt_local_entry, flags);
 952
 953         /* The local client has to be marked as "pending to be removed" but has
 954          * to be kept in the table in order to send it in a full table
 955          * response issued before the net ttvn increment (consistency check)
 956          */
 957         tt_local_entry->common.flags |= BATADV_TT_CLIENT_PENDING;
 958
 959         batadv_dbg(BATADV_DBG_TT, bat_priv,
 960                    "Local tt entry (%pM, vid: %d) pending to be removed: %s\n",
 961                    tt_local_entry->common.addr,
 962                    BATADV_PRINT_VID(tt_local_entry->common.vid), message);
 963 }
 964
 965 /**
 966  * batadv_tt_local_remove - logically remove an entry from the local table
 967  * @bat_priv: the bat priv with all the soft interface information
 968  * @addr: the MAC address of the client to remove
 969  * @vid: VLAN identifier
 970  * @message: message to append to the log on deletion
 971  * @roaming: true if the deletion is due to a roaming event
 972  *
 973  * Returns the flags assigned to the local entry before being deleted
 974  */
 975 uint16_t batadv_tt_local_remove(struct batadv_priv *bat_priv,
 976                                 const uint8_t *addr, unsigned short vid,
 977                                 const char *message, bool roaming)
 978 {
 979         struct batadv_tt_local_entry *tt_local_entry;
 980         uint16_t flags, curr_flags = BATADV_NO_FLAGS;
 981
 982         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
 983         if (!tt_local_entry)
 984                 goto out;
 985
 986         curr_flags = tt_local_entry->common.flags;
 987
 988         flags = BATADV_TT_CLIENT_DEL;
 989         /* if this global entry addition is due to a roaming, the node has to
 990          * mark the local entry as "roamed" in order to correctly reroute
 991          * packets later
 992          */
 993         if (roaming) {
 994                 flags |= BATADV_TT_CLIENT_ROAM;
 995                 /* mark the local client as ROAMed */
 996                 tt_local_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
 997         }
 998
 999         if (!(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW)) {
1000                 batadv_tt_local_set_pending(bat_priv, tt_local_entry, flags,
1001                                             message);
1002                 goto out;
1003         }
1004         /* if this client has been added right now, it is possible to
1005          * immediately purge it
1006          */
1007         batadv_tt_local_event(bat_priv, tt_local_entry, BATADV_TT_CLIENT_DEL);
1008         hlist_del_rcu(&tt_local_entry->common.hash_entry);
1009         batadv_tt_local_entry_free_ref(tt_local_entry);
1010
1011 out:
1012         if (tt_local_entry)
1013                 batadv_tt_local_entry_free_ref(tt_local_entry);
1014
1015         return curr_flags;
1016 }
1017
1018 /**
1019  * batadv_tt_local_purge_list - purge inactive tt local entries
1020  * @bat_priv: the bat priv with all the soft interface information
1021  * @head: pointer to the list containing the local tt entries
1022  * @timeout: parameter deciding whether a given tt local entry is considered
1023  *  inactive or not
1024  */
1025 static void batadv_tt_local_purge_list(struct batadv_priv *bat_priv,
1026                                        struct hlist_head *head,
1027                                        int timeout)
1028 {
1029         struct batadv_tt_local_entry *tt_local_entry;
1030         struct batadv_tt_common_entry *tt_common_entry;
1031         struct hlist_node *node_tmp;
1032
1033         hlist_for_each_entry_safe(tt_common_entry, node_tmp, head,
1034                                   hash_entry) {
1035                 tt_local_entry = container_of(tt_common_entry,
1036                                               struct batadv_tt_local_entry,
1037                                               common);
1038                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_NOPURGE)
1039                         continue;
1040
1041                 /* entry already marked for deletion */
1042                 if (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING)
1043                         continue;
1044
1045                 if (!batadv_has_timed_out(tt_local_entry->last_seen, timeout))
1046                         continue;
1047
1048                 batadv_tt_local_set_pending(bat_priv, tt_local_entry,
1049                                             BATADV_TT_CLIENT_DEL, "timed out");
1050         }
1051 }
1052
1053 /**
1054  * batadv_tt_local_purge - purge inactive tt local entries
1055  * @bat_priv: the bat priv with all the soft interface information
1056  * @timeout: parameter deciding whether a given tt local entry is considered
1057  *  inactive or not
1058  */
1059 static void batadv_tt_local_purge(struct batadv_priv *bat_priv,
1060                                   int timeout)
1061 {
1062         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
1063         struct hlist_head *head;
1064         spinlock_t *list_lock; /* protects write access to the hash lists */
1065         uint32_t i;
1066
1067         for (i = 0; i < hash->size; i++) {
1068                 head = &hash->table[i];
1069                 list_lock = &hash->list_locks[i];
1070
1071                 spin_lock_bh(list_lock);
1072                 batadv_tt_local_purge_list(bat_priv, head, timeout);
1073                 spin_unlock_bh(list_lock);
1074         }
1075 }
1076
1077 static void batadv_tt_local_table_free(struct batadv_priv *bat_priv)
1078 {
1079         struct batadv_hashtable *hash;
1080         spinlock_t *list_lock; /* protects write access to the hash lists */
1081         struct batadv_tt_common_entry *tt_common_entry;
1082         struct batadv_tt_local_entry *tt_local;
1083         struct hlist_node *node_tmp;
1084         struct hlist_head *head;
1085         uint32_t i;
1086
1087         if (!bat_priv->tt.local_hash)
1088                 return;
1089
1090         hash = bat_priv->tt.local_hash;
1091
1092         for (i = 0; i < hash->size; i++) {
1093                 head = &hash->table[i];
1094                 list_lock = &hash->list_locks[i];
1095
1096                 spin_lock_bh(list_lock);
1097                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1098                                           head, hash_entry) {
1099                         hlist_del_rcu(&tt_common_entry->hash_entry);
1100                         tt_local = container_of(tt_common_entry,
1101                                                 struct batadv_tt_local_entry,
1102                                                 common);
1103                         batadv_tt_local_entry_free_ref(tt_local);
1104                 }
1105                 spin_unlock_bh(list_lock);
1106         }
1107
1108         batadv_hash_destroy(hash);
1109
1110         bat_priv->tt.local_hash = NULL;
1111 }
1112
1113 static int batadv_tt_global_init(struct batadv_priv *bat_priv)
1114 {
1115         if (bat_priv->tt.global_hash)
1116                 return 0;
1117
1118         bat_priv->tt.global_hash = batadv_hash_new(1024);
1119
1120         if (!bat_priv->tt.global_hash)
1121                 return -ENOMEM;
1122
1123         batadv_hash_set_lock_class(bat_priv->tt.global_hash,
1124                                    &batadv_tt_global_hash_lock_class_key);
1125
1126         return 0;
1127 }
1128
1129 static void batadv_tt_changes_list_free(struct batadv_priv *bat_priv)
1130 {
1131         struct batadv_tt_change_node *entry, *safe;
1132
1133         spin_lock_bh(&bat_priv->tt.changes_list_lock);
1134
1135         list_for_each_entry_safe(entry, safe, &bat_priv->tt.changes_list,
1136                                  list) {
1137                 list_del(&entry->list);
1138                 kfree(entry);
1139         }
1140
1141         atomic_set(&bat_priv->tt.local_changes, 0);
1142         spin_unlock_bh(&bat_priv->tt.changes_list_lock);
1143 }
1144
1145 /* retrieves the orig_tt_list_entry belonging to orig_node from the
1146  * batadv_tt_global_entry list
1147  *
1148  * returns it with an increased refcounter, NULL if not found
1149  */
1150 static struct batadv_tt_orig_list_entry *
1151 batadv_tt_global_orig_entry_find(const struct batadv_tt_global_entry *entry,
1152                                  const struct batadv_orig_node *orig_node)
1153 {
1154         struct batadv_tt_orig_list_entry *tmp_orig_entry, *orig_entry = NULL;
1155         const struct hlist_head *head;
1156
1157         rcu_read_lock();
1158         head = &entry->orig_list;
1159         hlist_for_each_entry_rcu(tmp_orig_entry, head, list) {
1160                 if (tmp_orig_entry->orig_node != orig_node)
1161                         continue;
1162                 if (!atomic_inc_not_zero(&tmp_orig_entry->refcount))
1163                         continue;
1164
1165                 orig_entry = tmp_orig_entry;
1166                 break;
1167         }
1168         rcu_read_unlock();
1169
1170         return orig_entry;
1171 }
1172
1173 /* find out if an orig_node is already in the list of a tt_global_entry.
1174  * returns true if found, false otherwise
1175  */
1176 static bool
1177 batadv_tt_global_entry_has_orig(const struct batadv_tt_global_entry *entry,
1178                                 const struct batadv_orig_node *orig_node)
1179 {
1180         struct batadv_tt_orig_list_entry *orig_entry;
1181         bool found = false;
1182
1183         orig_entry = batadv_tt_global_orig_entry_find(entry, orig_node);
1184         if (orig_entry) {
1185                 found = true;
1186                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1187         }
1188
1189         return found;
1190 }
1191
1192 static void
1193 batadv_tt_global_orig_entry_add(struct batadv_tt_global_entry *tt_global,
1194                                 struct batadv_orig_node *orig_node, int ttvn)
1195 {
1196         struct batadv_tt_orig_list_entry *orig_entry;
1197
1198         orig_entry = batadv_tt_global_orig_entry_find(tt_global, orig_node);
1199         if (orig_entry) {
1200                 /* refresh the ttvn: the current value could be a bogus one that
1201                  * was added during a "temporary client detection"
1202                  */
1203                 orig_entry->ttvn = ttvn;
1204                 goto out;
1205         }
1206
1207         orig_entry = kzalloc(sizeof(*orig_entry), GFP_ATOMIC);
1208         if (!orig_entry)
1209                 goto out;
1210
1211         INIT_HLIST_NODE(&orig_entry->list);
1212         atomic_inc(&orig_node->refcount);
1213         batadv_tt_global_size_inc(orig_node, tt_global->common.vid);
1214         orig_entry->orig_node = orig_node;
1215         orig_entry->ttvn = ttvn;
1216         atomic_set(&orig_entry->refcount, 2);
1217
1218         spin_lock_bh(&tt_global->list_lock);
1219         hlist_add_head_rcu(&orig_entry->list,
1220                            &tt_global->orig_list);
1221         spin_unlock_bh(&tt_global->list_lock);
1222 out:
1223         if (orig_entry)
1224                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1225 }
1226
1227 /**
1228  * batadv_tt_global_add - add a new TT global entry or update an existing one
1229  * @bat_priv: the bat priv with all the soft interface information
1230  * @orig_node: the originator announcing the client
1231  * @tt_addr: the mac address of the non-mesh client
1232  * @vid: VLAN identifier
1233  * @flags: TT flags that have to be set for this non-mesh client
1234  * @ttvn: the tt version number ever announcing this non-mesh client
1235  *
1236  * Add a new TT global entry for the given originator. If the entry already
1237  * exists add a new reference to the given originator (a global entry can have
1238  * references to multiple originators) and adjust the flags attribute to reflect
1239  * the function argument.
1240  * If a TT local entry exists for this non-mesh client remove it.
1241  *
1242  * The caller must hold orig_node refcount.
1243  *
1244  * Return true if the new entry has been added, false otherwise
1245  */
1246 static bool batadv_tt_global_add(struct batadv_priv *bat_priv,
1247                                  struct batadv_orig_node *orig_node,
1248                                  const unsigned char *tt_addr,
1249                                  unsigned short vid, uint16_t flags,
1250                                  uint8_t ttvn)
1251 {
1252         struct batadv_tt_global_entry *tt_global_entry;
1253         struct batadv_tt_local_entry *tt_local_entry;
1254         bool ret = false;
1255         int hash_added;
1256         struct batadv_tt_common_entry *common;
1257         uint16_t local_flags;
1258
1259         /* ignore global entries from backbone nodes */
1260         if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig, vid))
1261                 return true;
1262
1263         tt_global_entry = batadv_tt_global_hash_find(bat_priv, tt_addr, vid);
1264         tt_local_entry = batadv_tt_local_hash_find(bat_priv, tt_addr, vid);
1265
1266         /* if the node already has a local client for this entry, it has to wait
1267          * for a roaming advertisement instead of manually messing up the global
1268          * table
1269          */
1270         if ((flags & BATADV_TT_CLIENT_TEMP) && tt_local_entry &&
1271             !(tt_local_entry->common.flags & BATADV_TT_CLIENT_NEW))
1272                 goto out;
1273
1274         if (!tt_global_entry) {
1275                 tt_global_entry = kzalloc(sizeof(*tt_global_entry), GFP_ATOMIC);
1276                 if (!tt_global_entry)
1277                         goto out;
1278
1279                 common = &tt_global_entry->common;
1280                 memcpy(common->addr, tt_addr, ETH_ALEN);
1281                 common->vid = vid;
1282
1283                 common->flags = flags;
1284                 tt_global_entry->roam_at = 0;
1285                 /* node must store current time in case of roaming. This is
1286                  * needed to purge this entry out on timeout (if nobody claims
1287                  * it)
1288                  */
1289                 if (flags & BATADV_TT_CLIENT_ROAM)
1290                         tt_global_entry->roam_at = jiffies;
1291                 atomic_set(&common->refcount, 2);
1292                 common->added_at = jiffies;
1293
1294                 INIT_HLIST_HEAD(&tt_global_entry->orig_list);
1295                 spin_lock_init(&tt_global_entry->list_lock);
1296
1297                 hash_added = batadv_hash_add(bat_priv->tt.global_hash,
1298                                              batadv_compare_tt,
1299                                              batadv_choose_tt, common,
1300                                              &common->hash_entry);
1301
1302                 if (unlikely(hash_added != 0)) {
1303                         /* remove the reference for the hash */
1304                         batadv_tt_global_entry_free_ref(tt_global_entry);
1305                         goto out_remove;
1306                 }
1307         } else {
1308                 common = &tt_global_entry->common;
1309                 /* If there is already a global entry, we can use this one for
1310                  * our processing.
1311                  * But if we are trying to add a temporary client then here are
1312                  * two options at this point:
1313                  * 1) the global client is not a temporary client: the global
1314                  *    client has to be left as it is, temporary information
1315                  *    should never override any already known client state
1316                  * 2) the global client is a temporary client: purge the
1317                  *    originator list and add the new one orig_entry
1318                  */
1319                 if (flags & BATADV_TT_CLIENT_TEMP) {
1320                         if (!(common->flags & BATADV_TT_CLIENT_TEMP))
1321                                 goto out;
1322                         if (batadv_tt_global_entry_has_orig(tt_global_entry,
1323                                                             orig_node))
1324                                 goto out_remove;
1325                         batadv_tt_global_del_orig_list(tt_global_entry);
1326                         goto add_orig_entry;
1327                 }
1328
1329                 /* if the client was temporary added before receiving the first
1330                  * OGM announcing it, we have to clear the TEMP flag
1331                  */
1332                 common->flags &= ~BATADV_TT_CLIENT_TEMP;
1333
1334                 /* the change can carry possible "attribute" flags like the
1335                  * TT_CLIENT_WIFI, therefore they have to be copied in the
1336                  * client entry
1337                  */
1338                 tt_global_entry->common.flags |= flags;
1339
1340                 /* If there is the BATADV_TT_CLIENT_ROAM flag set, there is only
1341                  * one originator left in the list and we previously received a
1342                  * delete + roaming change for this originator.
1343                  *
1344                  * We should first delete the old originator before adding the
1345                  * new one.
1346                  */
1347                 if (common->flags & BATADV_TT_CLIENT_ROAM) {
1348                         batadv_tt_global_del_orig_list(tt_global_entry);
1349                         common->flags &= ~BATADV_TT_CLIENT_ROAM;
1350                         tt_global_entry->roam_at = 0;
1351                 }
1352         }
1353 add_orig_entry:
1354         /* add the new orig_entry (if needed) or update it */
1355         batadv_tt_global_orig_entry_add(tt_global_entry, orig_node, ttvn);
1356
1357         batadv_dbg(BATADV_DBG_TT, bat_priv,
1358                    "Creating new global tt entry: %pM (vid: %d, via %pM)\n",
1359                    common->addr, BATADV_PRINT_VID(common->vid),
1360                    orig_node->orig);
1361         ret = true;
1362
1363 out_remove:
1364
1365         /* remove address from local hash if present */
1366         local_flags = batadv_tt_local_remove(bat_priv, tt_addr, vid,
1367                                              "global tt received",
1368                                              flags & BATADV_TT_CLIENT_ROAM);
1369         tt_global_entry->common.flags |= local_flags & BATADV_TT_CLIENT_WIFI;
1370
1371         if (!(flags & BATADV_TT_CLIENT_ROAM))
1372                 /* this is a normal global add. Therefore the client is not in a
1373                  * roaming state anymore.
1374                  */
1375                 tt_global_entry->common.flags &= ~BATADV_TT_CLIENT_ROAM;
1376
1377 out:
1378         if (tt_global_entry)
1379                 batadv_tt_global_entry_free_ref(tt_global_entry);
1380         if (tt_local_entry)
1381                 batadv_tt_local_entry_free_ref(tt_local_entry);
1382         return ret;
1383 }
1384
1385 /**
1386  * batadv_transtable_best_orig - Get best originator list entry from tt entry
1387  * @bat_priv: the bat priv with all the soft interface information
1388  * @tt_global_entry: global translation table entry to be analyzed
1389  *
1390  * This functon assumes the caller holds rcu_read_lock().
1391  * Returns best originator list entry or NULL on errors.
1392  */
1393 static struct batadv_tt_orig_list_entry *
1394 batadv_transtable_best_orig(struct batadv_priv *bat_priv,
1395                             struct batadv_tt_global_entry *tt_global_entry)
1396 {
1397         struct batadv_neigh_node *router, *best_router = NULL;
1398         struct batadv_algo_ops *bao = bat_priv->bat_algo_ops;
1399         struct hlist_head *head;
1400         struct batadv_tt_orig_list_entry *orig_entry, *best_entry = NULL;
1401
1402         head = &tt_global_entry->orig_list;
1403         hlist_for_each_entry_rcu(orig_entry, head, list) {
1404                 router = batadv_orig_router_get(orig_entry->orig_node,
1405                                                 BATADV_IF_DEFAULT);
1406                 if (!router)
1407                         continue;
1408
1409                 if (best_router &&
1410                     bao->bat_neigh_cmp(router, BATADV_IF_DEFAULT,
1411                                        best_router, BATADV_IF_DEFAULT) <= 0) {
1412                         batadv_neigh_node_free_ref(router);
1413                         continue;
1414                 }
1415
1416                 /* release the refcount for the "old" best */
1417                 if (best_router)
1418                         batadv_neigh_node_free_ref(best_router);
1419
1420                 best_entry = orig_entry;
1421                 best_router = router;
1422         }
1423
1424         if (best_router)
1425                 batadv_neigh_node_free_ref(best_router);
1426
1427         return best_entry;
1428 }
1429
1430 /**
1431  * batadv_tt_global_print_entry - print all orig nodes who announce the address
1432  *  for this global entry
1433  * @bat_priv: the bat priv with all the soft interface information
1434  * @tt_global_entry: global translation table entry to be printed
1435  * @seq: debugfs table seq_file struct
1436  *
1437  * This functon assumes the caller holds rcu_read_lock().
1438  */
1439 static void
1440 batadv_tt_global_print_entry(struct batadv_priv *bat_priv,
1441                              struct batadv_tt_global_entry *tt_global_entry,
1442                              struct seq_file *seq)
1443 {
1444         struct batadv_tt_orig_list_entry *orig_entry, *best_entry;
1445         struct batadv_tt_common_entry *tt_common_entry;
1446         struct batadv_orig_node_vlan *vlan;
1447         struct hlist_head *head;
1448         uint8_t last_ttvn;
1449         uint16_t flags;
1450
1451         tt_common_entry = &tt_global_entry->common;
1452         flags = tt_common_entry->flags;
1453
1454         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1455         if (best_entry) {
1456                 vlan = batadv_orig_node_vlan_get(best_entry->orig_node,
1457                                                  tt_common_entry->vid);
1458                 if (!vlan) {
1459                         seq_printf(seq,
1460                                    " * Cannot retrieve VLAN %d for originator %pM\n",
1461                                    BATADV_PRINT_VID(tt_common_entry->vid),
1462                                    best_entry->orig_node->orig);
1463                         goto print_list;
1464                 }
1465
1466                 last_ttvn = atomic_read(&best_entry->orig_node->last_ttvn);
1467                 seq_printf(seq,
1468                            " %c %pM %4i   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1469                            '*', tt_global_entry->common.addr,
1470                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1471                            best_entry->ttvn, best_entry->orig_node->orig,
1472                            last_ttvn, vlan->tt.crc,
1473                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1474                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1475                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1476                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1477
1478                 batadv_orig_node_vlan_free_ref(vlan);
1479         }
1480
1481 print_list:
1482         head = &tt_global_entry->orig_list;
1483
1484         hlist_for_each_entry_rcu(orig_entry, head, list) {
1485                 if (best_entry == orig_entry)
1486                         continue;
1487
1488                 vlan = batadv_orig_node_vlan_get(orig_entry->orig_node,
1489                                                  tt_common_entry->vid);
1490                 if (!vlan) {
1491                         seq_printf(seq,
1492                                    " + Cannot retrieve VLAN %d for originator %pM\n",
1493                                    BATADV_PRINT_VID(tt_common_entry->vid),
1494                                    orig_entry->orig_node->orig);
1495                         continue;
1496                 }
1497
1498                 last_ttvn = atomic_read(&orig_entry->orig_node->last_ttvn);
1499                 seq_printf(seq,
1500                            " %c %pM %4d   (%3u) via %pM     (%3u)   (%#.8x) [%c%c%c%c]\n",
1501                            '+', tt_global_entry->common.addr,
1502                            BATADV_PRINT_VID(tt_global_entry->common.vid),
1503                            orig_entry->ttvn, orig_entry->orig_node->orig,
1504                            last_ttvn, vlan->tt.crc,
1505                            (flags & BATADV_TT_CLIENT_ROAM ? 'R' : '.'),
1506                            (flags & BATADV_TT_CLIENT_WIFI ? 'W' : '.'),
1507                            (flags & BATADV_TT_CLIENT_ISOLA ? 'I' : '.'),
1508                            (flags & BATADV_TT_CLIENT_TEMP ? 'T' : '.'));
1509
1510                 batadv_orig_node_vlan_free_ref(vlan);
1511         }
1512 }
1513
1514 int batadv_tt_global_seq_print_text(struct seq_file *seq, void *offset)
1515 {
1516         struct net_device *net_dev = (struct net_device *)seq->private;
1517         struct batadv_priv *bat_priv = netdev_priv(net_dev);
1518         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1519         struct batadv_tt_common_entry *tt_common_entry;
1520         struct batadv_tt_global_entry *tt_global;
1521         struct batadv_hard_iface *primary_if;
1522         struct hlist_head *head;
1523         uint32_t i;
1524
1525         primary_if = batadv_seq_print_text_primary_if_get(seq);
1526         if (!primary_if)
1527                 goto out;
1528
1529         seq_printf(seq,
1530                    "Globally announced TT entries received via the mesh %s\n",
1531                    net_dev->name);
1532         seq_printf(seq, "       %-13s  %s  %s       %-15s %s (%-10s) %s\n",
1533                    "Client", "VID", "(TTVN)", "Originator", "(Curr TTVN)",
1534                    "CRC", "Flags");
1535
1536         for (i = 0; i < hash->size; i++) {
1537                 head = &hash->table[i];
1538
1539                 rcu_read_lock();
1540                 hlist_for_each_entry_rcu(tt_common_entry,
1541                                          head, hash_entry) {
1542                         tt_global = container_of(tt_common_entry,
1543                                                  struct batadv_tt_global_entry,
1544                                                  common);
1545                         batadv_tt_global_print_entry(bat_priv, tt_global, seq);
1546                 }
1547                 rcu_read_unlock();
1548         }
1549 out:
1550         if (primary_if)
1551                 batadv_hardif_free_ref(primary_if);
1552         return 0;
1553 }
1554
1555 /* deletes the orig list of a tt_global_entry */
1556 static void
1557 batadv_tt_global_del_orig_list(struct batadv_tt_global_entry *tt_global_entry)
1558 {
1559         struct hlist_head *head;
1560         struct hlist_node *safe;
1561         struct batadv_tt_orig_list_entry *orig_entry;
1562
1563         spin_lock_bh(&tt_global_entry->list_lock);
1564         head = &tt_global_entry->orig_list;
1565         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1566                 hlist_del_rcu(&orig_entry->list);
1567                 batadv_tt_global_size_dec(orig_entry->orig_node,
1568                                           tt_global_entry->common.vid);
1569                 batadv_tt_orig_list_entry_free_ref(orig_entry);
1570         }
1571         spin_unlock_bh(&tt_global_entry->list_lock);
1572 }
1573
1574 static void
1575 batadv_tt_global_del_orig_entry(struct batadv_priv *bat_priv,
1576                                 struct batadv_tt_global_entry *tt_global_entry,
1577                                 struct batadv_orig_node *orig_node,
1578                                 const char *message)
1579 {
1580         struct hlist_head *head;
1581         struct hlist_node *safe;
1582         struct batadv_tt_orig_list_entry *orig_entry;
1583         unsigned short vid;
1584
1585         spin_lock_bh(&tt_global_entry->list_lock);
1586         head = &tt_global_entry->orig_list;
1587         hlist_for_each_entry_safe(orig_entry, safe, head, list) {
1588                 if (orig_entry->orig_node == orig_node) {
1589                         vid = tt_global_entry->common.vid;
1590                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1591                                    "Deleting %pM from global tt entry %pM (vid: %d): %s\n",
1592                                    orig_node->orig,
1593                                    tt_global_entry->common.addr,
1594                                    BATADV_PRINT_VID(vid), message);
1595                         hlist_del_rcu(&orig_entry->list);
1596                         batadv_tt_global_size_dec(orig_node,
1597                                                   tt_global_entry->common.vid);
1598                         batadv_tt_orig_list_entry_free_ref(orig_entry);
1599                 }
1600         }
1601         spin_unlock_bh(&tt_global_entry->list_lock);
1602 }
1603
1604 /* If the client is to be deleted, we check if it is the last origantor entry
1605  * within tt_global entry. If yes, we set the BATADV_TT_CLIENT_ROAM flag and the
1606  * timer, otherwise we simply remove the originator scheduled for deletion.
1607  */
1608 static void
1609 batadv_tt_global_del_roaming(struct batadv_priv *bat_priv,
1610                              struct batadv_tt_global_entry *tt_global_entry,
1611                              struct batadv_orig_node *orig_node,
1612                              const char *message)
1613 {
1614         bool last_entry = true;
1615         struct hlist_head *head;
1616         struct batadv_tt_orig_list_entry *orig_entry;
1617
1618         /* no local entry exists, case 1:
1619          * Check if this is the last one or if other entries exist.
1620          */
1621
1622         rcu_read_lock();
1623         head = &tt_global_entry->orig_list;
1624         hlist_for_each_entry_rcu(orig_entry, head, list) {
1625                 if (orig_entry->orig_node != orig_node) {
1626                         last_entry = false;
1627                         break;
1628                 }
1629         }
1630         rcu_read_unlock();
1631
1632         if (last_entry) {
1633                 /* its the last one, mark for roaming. */
1634                 tt_global_entry->common.flags |= BATADV_TT_CLIENT_ROAM;
1635                 tt_global_entry->roam_at = jiffies;
1636         } else
1637                 /* there is another entry, we can simply delete this
1638                  * one and can still use the other one.
1639                  */
1640                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1641                                                 orig_node, message);
1642 }
1643
1644 /**
1645  * batadv_tt_global_del - remove a client from the global table
1646  * @bat_priv: the bat priv with all the soft interface information
1647  * @orig_node: an originator serving this client
1648  * @addr: the mac address of the client
1649  * @vid: VLAN identifier
1650  * @message: a message explaining the reason for deleting the client to print
1651  *  for debugging purpose
1652  * @roaming: true if the deletion has been triggered by a roaming event
1653  */
1654 static void batadv_tt_global_del(struct batadv_priv *bat_priv,
1655                                  struct batadv_orig_node *orig_node,
1656                                  const unsigned char *addr, unsigned short vid,
1657                                  const char *message, bool roaming)
1658 {
1659         struct batadv_tt_global_entry *tt_global_entry;
1660         struct batadv_tt_local_entry *local_entry = NULL;
1661
1662         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1663         if (!tt_global_entry)
1664                 goto out;
1665
1666         if (!roaming) {
1667                 batadv_tt_global_del_orig_entry(bat_priv, tt_global_entry,
1668                                                 orig_node, message);
1669
1670                 if (hlist_empty(&tt_global_entry->orig_list))
1671                         batadv_tt_global_free(bat_priv, tt_global_entry,
1672                                               message);
1673
1674                 goto out;
1675         }
1676
1677         /* if we are deleting a global entry due to a roam
1678          * event, there are two possibilities:
1679          * 1) the client roamed from node A to node B => if there
1680          *    is only one originator left for this client, we mark
1681          *    it with BATADV_TT_CLIENT_ROAM, we start a timer and we
1682          *    wait for node B to claim it. In case of timeout
1683          *    the entry is purged.
1684          *
1685          *    If there are other originators left, we directly delete
1686          *    the originator.
1687          * 2) the client roamed to us => we can directly delete
1688          *    the global entry, since it is useless now.
1689          */
1690         local_entry = batadv_tt_local_hash_find(bat_priv,
1691                                                 tt_global_entry->common.addr,
1692                                                 vid);
1693         if (local_entry) {
1694                 /* local entry exists, case 2: client roamed to us. */
1695                 batadv_tt_global_del_orig_list(tt_global_entry);
1696                 batadv_tt_global_free(bat_priv, tt_global_entry, message);
1697         } else
1698                 /* no local entry exists, case 1: check for roaming */
1699                 batadv_tt_global_del_roaming(bat_priv, tt_global_entry,
1700                                              orig_node, message);
1701
1702
1703 out:
1704         if (tt_global_entry)
1705                 batadv_tt_global_entry_free_ref(tt_global_entry);
1706         if (local_entry)
1707                 batadv_tt_local_entry_free_ref(local_entry);
1708 }
1709
1710 /**
1711  * batadv_tt_global_del_orig - remove all the TT global entries belonging to the
1712  *  given originator matching the provided vid
1713  * @bat_priv: the bat priv with all the soft interface information
1714  * @orig_node: the originator owning the entries to remove
1715  * @match_vid: the VLAN identifier to match. If negative all the entries will be
1716  *  removed
1717  * @message: debug message to print as "reason"
1718  */
1719 void batadv_tt_global_del_orig(struct batadv_priv *bat_priv,
1720                                struct batadv_orig_node *orig_node,
1721                                int32_t match_vid,
1722                                const char *message)
1723 {
1724         struct batadv_tt_global_entry *tt_global;
1725         struct batadv_tt_common_entry *tt_common_entry;
1726         uint32_t i;
1727         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1728         struct hlist_node *safe;
1729         struct hlist_head *head;
1730         spinlock_t *list_lock; /* protects write access to the hash lists */
1731         unsigned short vid;
1732
1733         if (!hash)
1734                 return;
1735
1736         for (i = 0; i < hash->size; i++) {
1737                 head = &hash->table[i];
1738                 list_lock = &hash->list_locks[i];
1739
1740                 spin_lock_bh(list_lock);
1741                 hlist_for_each_entry_safe(tt_common_entry, safe,
1742                                           head, hash_entry) {
1743                         /* remove only matching entries */
1744                         if (match_vid >= 0 && tt_common_entry->vid != match_vid)
1745                                 continue;
1746
1747                         tt_global = container_of(tt_common_entry,
1748                                                  struct batadv_tt_global_entry,
1749                                                  common);
1750
1751                         batadv_tt_global_del_orig_entry(bat_priv, tt_global,
1752                                                         orig_node, message);
1753
1754                         if (hlist_empty(&tt_global->orig_list)) {
1755                                 vid = tt_global->common.vid;
1756                                 batadv_dbg(BATADV_DBG_TT, bat_priv,
1757                                            "Deleting global tt entry %pM (vid: %d): %s\n",
1758                                            tt_global->common.addr,
1759                                            BATADV_PRINT_VID(vid), message);
1760                                 hlist_del_rcu(&tt_common_entry->hash_entry);
1761                                 batadv_tt_global_entry_free_ref(tt_global);
1762                         }
1763                 }
1764                 spin_unlock_bh(list_lock);
1765         }
1766         orig_node->tt_initialised = false;
1767 }
1768
1769 static bool batadv_tt_global_to_purge(struct batadv_tt_global_entry *tt_global,
1770                                       char **msg)
1771 {
1772         bool purge = false;
1773         unsigned long roam_timeout = BATADV_TT_CLIENT_ROAM_TIMEOUT;
1774         unsigned long temp_timeout = BATADV_TT_CLIENT_TEMP_TIMEOUT;
1775
1776         if ((tt_global->common.flags & BATADV_TT_CLIENT_ROAM) &&
1777             batadv_has_timed_out(tt_global->roam_at, roam_timeout)) {
1778                 purge = true;
1779                 *msg = "Roaming timeout\n";
1780         }
1781
1782         if ((tt_global->common.flags & BATADV_TT_CLIENT_TEMP) &&
1783             batadv_has_timed_out(tt_global->common.added_at, temp_timeout)) {
1784                 purge = true;
1785                 *msg = "Temporary client timeout\n";
1786         }
1787
1788         return purge;
1789 }
1790
1791 static void batadv_tt_global_purge(struct batadv_priv *bat_priv)
1792 {
1793         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1794         struct hlist_head *head;
1795         struct hlist_node *node_tmp;
1796         spinlock_t *list_lock; /* protects write access to the hash lists */
1797         uint32_t i;
1798         char *msg = NULL;
1799         struct batadv_tt_common_entry *tt_common;
1800         struct batadv_tt_global_entry *tt_global;
1801
1802         for (i = 0; i < hash->size; i++) {
1803                 head = &hash->table[i];
1804                 list_lock = &hash->list_locks[i];
1805
1806                 spin_lock_bh(list_lock);
1807                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
1808                                           hash_entry) {
1809                         tt_global = container_of(tt_common,
1810                                                  struct batadv_tt_global_entry,
1811                                                  common);
1812
1813                         if (!batadv_tt_global_to_purge(tt_global, &msg))
1814                                 continue;
1815
1816                         batadv_dbg(BATADV_DBG_TT, bat_priv,
1817                                    "Deleting global tt entry %pM (vid: %d): %s\n",
1818                                    tt_global->common.addr,
1819                                    BATADV_PRINT_VID(tt_global->common.vid),
1820                                    msg);
1821
1822                         hlist_del_rcu(&tt_common->hash_entry);
1823
1824                         batadv_tt_global_entry_free_ref(tt_global);
1825                 }
1826                 spin_unlock_bh(list_lock);
1827         }
1828 }
1829
1830 static void batadv_tt_global_table_free(struct batadv_priv *bat_priv)
1831 {
1832         struct batadv_hashtable *hash;
1833         spinlock_t *list_lock; /* protects write access to the hash lists */
1834         struct batadv_tt_common_entry *tt_common_entry;
1835         struct batadv_tt_global_entry *tt_global;
1836         struct hlist_node *node_tmp;
1837         struct hlist_head *head;
1838         uint32_t i;
1839
1840         if (!bat_priv->tt.global_hash)
1841                 return;
1842
1843         hash = bat_priv->tt.global_hash;
1844
1845         for (i = 0; i < hash->size; i++) {
1846                 head = &hash->table[i];
1847                 list_lock = &hash->list_locks[i];
1848
1849                 spin_lock_bh(list_lock);
1850                 hlist_for_each_entry_safe(tt_common_entry, node_tmp,
1851                                           head, hash_entry) {
1852                         hlist_del_rcu(&tt_common_entry->hash_entry);
1853                         tt_global = container_of(tt_common_entry,
1854                                                  struct batadv_tt_global_entry,
1855                                                  common);
1856                         batadv_tt_global_entry_free_ref(tt_global);
1857                 }
1858                 spin_unlock_bh(list_lock);
1859         }
1860
1861         batadv_hash_destroy(hash);
1862
1863         bat_priv->tt.global_hash = NULL;
1864 }
1865
1866 static bool
1867 _batadv_is_ap_isolated(struct batadv_tt_local_entry *tt_local_entry,
1868                        struct batadv_tt_global_entry *tt_global_entry)
1869 {
1870         bool ret = false;
1871
1872         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_WIFI &&
1873             tt_global_entry->common.flags & BATADV_TT_CLIENT_WIFI)
1874                 ret = true;
1875
1876         /* check if the two clients are marked as isolated */
1877         if (tt_local_entry->common.flags & BATADV_TT_CLIENT_ISOLA &&
1878             tt_global_entry->common.flags & BATADV_TT_CLIENT_ISOLA)
1879                 ret = true;
1880
1881         return ret;
1882 }
1883
1884 /**
1885  * batadv_transtable_search - get the mesh destination for a given client
1886  * @bat_priv: the bat priv with all the soft interface information
1887  * @src: mac address of the source client
1888  * @addr: mac address of the destination client
1889  * @vid: VLAN identifier
1890  *
1891  * Returns a pointer to the originator that was selected as destination in the
1892  * mesh for contacting the client 'addr', NULL otherwise.
1893  * In case of multiple originators serving the same client, the function returns
1894  * the best one (best in terms of metric towards the destination node).
1895  *
1896  * If the two clients are AP isolated the function returns NULL.
1897  */
1898 struct batadv_orig_node *batadv_transtable_search(struct batadv_priv *bat_priv,
1899                                                   const uint8_t *src,
1900                                                   const uint8_t *addr,
1901                                                   unsigned short vid)
1902 {
1903         struct batadv_tt_local_entry *tt_local_entry = NULL;
1904         struct batadv_tt_global_entry *tt_global_entry = NULL;
1905         struct batadv_orig_node *orig_node = NULL;
1906         struct batadv_tt_orig_list_entry *best_entry;
1907
1908         if (src && batadv_vlan_ap_isola_get(bat_priv, vid)) {
1909                 tt_local_entry = batadv_tt_local_hash_find(bat_priv, src, vid);
1910                 if (!tt_local_entry ||
1911                     (tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING))
1912                         goto out;
1913         }
1914
1915         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
1916         if (!tt_global_entry)
1917                 goto out;
1918
1919         /* check whether the clients should not communicate due to AP
1920          * isolation
1921          */
1922         if (tt_local_entry &&
1923             _batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
1924                 goto out;
1925
1926         rcu_read_lock();
1927         best_entry = batadv_transtable_best_orig(bat_priv, tt_global_entry);
1928         /* found anything? */
1929         if (best_entry)
1930                 orig_node = best_entry->orig_node;
1931         if (orig_node && !atomic_inc_not_zero(&orig_node->refcount))
1932                 orig_node = NULL;
1933         rcu_read_unlock();
1934
1935 out:
1936         if (tt_global_entry)
1937                 batadv_tt_global_entry_free_ref(tt_global_entry);
1938         if (tt_local_entry)
1939                 batadv_tt_local_entry_free_ref(tt_local_entry);
1940
1941         return orig_node;
1942 }
1943
1944 /**
1945  * batadv_tt_global_crc - calculates the checksum of the local table belonging
1946  *  to the given orig_node
1947  * @bat_priv: the bat priv with all the soft interface information
1948  * @orig_node: originator for which the CRC should be computed
1949  * @vid: VLAN identifier for which the CRC32 has to be computed
1950  *
1951  * This function computes the checksum for the global table corresponding to a
1952  * specific originator. In particular, the checksum is computed as follows: For
1953  * each client connected to the originator the CRC32C of the MAC address and the
1954  * VID is computed and then all the CRC32Cs of the various clients are xor'ed
1955  * together.
1956  *
1957  * The idea behind is that CRC32C should be used as much as possible in order to
1958  * produce a unique hash of the table, but since the order which is used to feed
1959  * the CRC32C function affects the result and since every node in the network
1960  * probably sorts the clients differently, the hash function cannot be directly
1961  * computed over the entire table. Hence the CRC32C is used only on
1962  * the single client entry, while all the results are then xor'ed together
1963  * because the XOR operation can combine them all while trying to reduce the
1964  * noise as much as possible.
1965  *
1966  * Returns the checksum of the global table of a given originator.
1967  */
1968 static uint32_t batadv_tt_global_crc(struct batadv_priv *bat_priv,
1969                                      struct batadv_orig_node *orig_node,
1970                                      unsigned short vid)
1971 {
1972         struct batadv_hashtable *hash = bat_priv->tt.global_hash;
1973         struct batadv_tt_common_entry *tt_common;
1974         struct batadv_tt_global_entry *tt_global;
1975         struct hlist_head *head;
1976         uint32_t i, crc_tmp, crc = 0;
1977         uint8_t flags;
1978
1979         for (i = 0; i < hash->size; i++) {
1980                 head = &hash->table[i];
1981
1982                 rcu_read_lock();
1983                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
1984                         tt_global = container_of(tt_common,
1985                                                  struct batadv_tt_global_entry,
1986                                                  common);
1987                         /* compute the CRC only for entries belonging to the
1988                          * VLAN identified by the vid passed as parameter
1989                          */
1990                         if (tt_common->vid != vid)
1991                                 continue;
1992
1993                         /* Roaming clients are in the global table for
1994                          * consistency only. They don't have to be
1995                          * taken into account while computing the
1996                          * global crc
1997                          */
1998                         if (tt_common->flags & BATADV_TT_CLIENT_ROAM)
1999                                 continue;
2000                         /* Temporary clients have not been announced yet, so
2001                          * they have to be skipped while computing the global
2002                          * crc
2003                          */
2004                         if (tt_common->flags & BATADV_TT_CLIENT_TEMP)
2005                                 continue;
2006
2007                         /* find out if this global entry is announced by this
2008                          * originator
2009                          */
2010                         if (!batadv_tt_global_entry_has_orig(tt_global,
2011                                                              orig_node))
2012                                 continue;
2013
2014                         crc_tmp = crc32c(0, &tt_common->vid,
2015                                          sizeof(tt_common->vid));
2016
2017                         /* compute the CRC on flags that have to be kept in sync
2018                          * among nodes
2019                          */
2020                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2021                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2022
2023                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2024                 }
2025                 rcu_read_unlock();
2026         }
2027
2028         return crc;
2029 }
2030
2031 /**
2032  * batadv_tt_local_crc - calculates the checksum of the local table
2033  * @bat_priv: the bat priv with all the soft interface information
2034  * @vid: VLAN identifier for which the CRC32 has to be computed
2035  *
2036  * For details about the computation, please refer to the documentation for
2037  * batadv_tt_global_crc().
2038  *
2039  * Returns the checksum of the local table
2040  */
2041 static uint32_t batadv_tt_local_crc(struct batadv_priv *bat_priv,
2042                                     unsigned short vid)
2043 {
2044         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
2045         struct batadv_tt_common_entry *tt_common;
2046         struct hlist_head *head;
2047         uint32_t i, crc_tmp, crc = 0;
2048         uint8_t flags;
2049
2050         for (i = 0; i < hash->size; i++) {
2051                 head = &hash->table[i];
2052
2053                 rcu_read_lock();
2054                 hlist_for_each_entry_rcu(tt_common, head, hash_entry) {
2055                         /* compute the CRC only for entries belonging to the
2056                          * VLAN identified by vid
2057                          */
2058                         if (tt_common->vid != vid)
2059                                 continue;
2060
2061                         /* not yet committed clients have not to be taken into
2062                          * account while computing the CRC
2063                          */
2064                         if (tt_common->flags & BATADV_TT_CLIENT_NEW)
2065                                 continue;
2066
2067                         crc_tmp = crc32c(0, &tt_common->vid,
2068                                          sizeof(tt_common->vid));
2069
2070                         /* compute the CRC on flags that have to be kept in sync
2071                          * among nodes
2072                          */
2073                         flags = tt_common->flags & BATADV_TT_SYNC_MASK;
2074                         crc_tmp = crc32c(crc_tmp, &flags, sizeof(flags));
2075
2076                         crc ^= crc32c(crc_tmp, tt_common->addr, ETH_ALEN);
2077                 }
2078                 rcu_read_unlock();
2079         }
2080
2081         return crc;
2082 }
2083
2084 static void batadv_tt_req_list_free(struct batadv_priv *bat_priv)
2085 {
2086         struct batadv_tt_req_node *node, *safe;
2087
2088         spin_lock_bh(&bat_priv->tt.req_list_lock);
2089
2090         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2091                 list_del(&node->list);
2092                 kfree(node);
2093         }
2094
2095         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2096 }
2097
2098 static void batadv_tt_save_orig_buffer(struct batadv_priv *bat_priv,
2099                                        struct batadv_orig_node *orig_node,
2100                                        const void *tt_buff,
2101                                        uint16_t tt_buff_len)
2102 {
2103         /* Replace the old buffer only if I received something in the
2104          * last OGM (the OGM could carry no changes)
2105          */
2106         spin_lock_bh(&orig_node->tt_buff_lock);
2107         if (tt_buff_len > 0) {
2108                 kfree(orig_node->tt_buff);
2109                 orig_node->tt_buff_len = 0;
2110                 orig_node->tt_buff = kmalloc(tt_buff_len, GFP_ATOMIC);
2111                 if (orig_node->tt_buff) {
2112                         memcpy(orig_node->tt_buff, tt_buff, tt_buff_len);
2113                         orig_node->tt_buff_len = tt_buff_len;
2114                 }
2115         }
2116         spin_unlock_bh(&orig_node->tt_buff_lock);
2117 }
2118
2119 static void batadv_tt_req_purge(struct batadv_priv *bat_priv)
2120 {
2121         struct batadv_tt_req_node *node, *safe;
2122
2123         spin_lock_bh(&bat_priv->tt.req_list_lock);
2124         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2125                 if (batadv_has_timed_out(node->issued_at,
2126                                          BATADV_TT_REQUEST_TIMEOUT)) {
2127                         list_del(&node->list);
2128                         kfree(node);
2129                 }
2130         }
2131         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2132 }
2133
2134 /* returns the pointer to the new tt_req_node struct if no request
2135  * has already been issued for this orig_node, NULL otherwise
2136  */
2137 static struct batadv_tt_req_node *
2138 batadv_new_tt_req_node(struct batadv_priv *bat_priv,
2139                        struct batadv_orig_node *orig_node)
2140 {
2141         struct batadv_tt_req_node *tt_req_node_tmp, *tt_req_node = NULL;
2142
2143         spin_lock_bh(&bat_priv->tt.req_list_lock);
2144         list_for_each_entry(tt_req_node_tmp, &bat_priv->tt.req_list, list) {
2145                 if (batadv_compare_eth(tt_req_node_tmp, orig_node) &&
2146                     !batadv_has_timed_out(tt_req_node_tmp->issued_at,
2147                                           BATADV_TT_REQUEST_TIMEOUT))
2148                         goto unlock;
2149         }
2150
2151         tt_req_node = kmalloc(sizeof(*tt_req_node), GFP_ATOMIC);
2152         if (!tt_req_node)
2153                 goto unlock;
2154
2155         memcpy(tt_req_node->addr, orig_node->orig, ETH_ALEN);
2156         tt_req_node->issued_at = jiffies;
2157
2158         list_add(&tt_req_node->list, &bat_priv->tt.req_list);
2159 unlock:
2160         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2161         return tt_req_node;
2162 }
2163
2164 /**
2165  * batadv_tt_local_valid - verify that given tt entry is a valid one
2166  * @entry_ptr: to be checked local tt entry
2167  * @data_ptr: not used but definition required to satisfy the callback prototype
2168  *
2169  * Returns 1 if the entry is a valid, 0 otherwise.
2170  */
2171 static int batadv_tt_local_valid(const void *entry_ptr, const void *data_ptr)
2172 {
2173         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2174
2175         if (tt_common_entry->flags & BATADV_TT_CLIENT_NEW)
2176                 return 0;
2177         return 1;
2178 }
2179
2180 static int batadv_tt_global_valid(const void *entry_ptr,
2181                                   const void *data_ptr)
2182 {
2183         const struct batadv_tt_common_entry *tt_common_entry = entry_ptr;
2184         const struct batadv_tt_global_entry *tt_global_entry;
2185         const struct batadv_orig_node *orig_node = data_ptr;
2186
2187         if (tt_common_entry->flags & BATADV_TT_CLIENT_ROAM ||
2188             tt_common_entry->flags & BATADV_TT_CLIENT_TEMP)
2189                 return 0;
2190
2191         tt_global_entry = container_of(tt_common_entry,
2192                                        struct batadv_tt_global_entry,
2193                                        common);
2194
2195         return batadv_tt_global_entry_has_orig(tt_global_entry, orig_node);
2196 }
2197
2198 /**
2199  * batadv_tt_tvlv_generate - fill the tvlv buff with the tt entries from the
2200  *  specified tt hash
2201  * @bat_priv: the bat priv with all the soft interface information
2202  * @hash: hash table containing the tt entries
2203  * @tt_len: expected tvlv tt data buffer length in number of bytes
2204  * @tvlv_buff: pointer to the buffer to fill with the TT data
2205  * @valid_cb: function to filter tt change entries
2206  * @cb_data: data passed to the filter function as argument
2207  */
2208 static void batadv_tt_tvlv_generate(struct batadv_priv *bat_priv,
2209                                     struct batadv_hashtable *hash,
2210                                     void *tvlv_buff, uint16_t tt_len,
2211                                     int (*valid_cb)(const void *, const void *),
2212                                     void *cb_data)
2213 {
2214         struct batadv_tt_common_entry *tt_common_entry;
2215         struct batadv_tvlv_tt_change *tt_change;
2216         struct hlist_head *head;
2217         uint16_t tt_tot, tt_num_entries = 0;
2218         uint32_t i;
2219
2220         tt_tot = batadv_tt_entries(tt_len);
2221         tt_change = (struct batadv_tvlv_tt_change *)tvlv_buff;
2222
2223         rcu_read_lock();
2224         for (i = 0; i < hash->size; i++) {
2225                 head = &hash->table[i];
2226
2227                 hlist_for_each_entry_rcu(tt_common_entry,
2228                                          head, hash_entry) {
2229                         if (tt_tot == tt_num_entries)
2230                                 break;
2231
2232                         if ((valid_cb) && (!valid_cb(tt_common_entry, cb_data)))
2233                                 continue;
2234
2235                         memcpy(tt_change->addr, tt_common_entry->addr,
2236                                ETH_ALEN);
2237                         tt_change->flags = tt_common_entry->flags;
2238                         tt_change->vid = htons(tt_common_entry->vid);
2239                         memset(tt_change->reserved, 0,
2240                                sizeof(tt_change->reserved));
2241
2242                         tt_num_entries++;
2243                         tt_change++;
2244                 }
2245         }
2246         rcu_read_unlock();
2247 }
2248
2249 /**
2250  * batadv_tt_global_check_crc - check if all the CRCs are correct
2251  * @orig_node: originator for which the CRCs have to be checked
2252  * @tt_vlan: pointer to the first tvlv VLAN entry
2253  * @num_vlan: number of tvlv VLAN entries
2254  * @create: if true, create VLAN objects if not found
2255  *
2256  * Return true if all the received CRCs match the locally stored ones, false
2257  * otherwise
2258  */
2259 static bool batadv_tt_global_check_crc(struct batadv_orig_node *orig_node,
2260                                        struct batadv_tvlv_tt_vlan_data *tt_vlan,
2261                                        uint16_t num_vlan)
2262 {
2263         struct batadv_tvlv_tt_vlan_data *tt_vlan_tmp;
2264         struct batadv_orig_node_vlan *vlan;
2265         uint32_t crc;
2266         int i;
2267
2268         /* check if each received CRC matches the locally stored one */
2269         for (i = 0; i < num_vlan; i++) {
2270                 tt_vlan_tmp = tt_vlan + i;
2271
2272                 /* if orig_node is a backbone node for this VLAN, don't check
2273                  * the CRC as we ignore all the global entries over it
2274                  */
2275                 if (batadv_bla_is_backbone_gw_orig(orig_node->bat_priv,
2276                                                    orig_node->orig,
2277                                                    ntohs(tt_vlan_tmp->vid)))
2278                         continue;
2279
2280                 vlan = batadv_orig_node_vlan_get(orig_node,
2281                                                  ntohs(tt_vlan_tmp->vid));
2282                 if (!vlan)
2283                         return false;
2284
2285                 crc = vlan->tt.crc;
2286                 batadv_orig_node_vlan_free_ref(vlan);
2287
2288                 if (crc != ntohl(tt_vlan_tmp->crc))
2289                         return false;
2290         }
2291
2292         return true;
2293 }
2294
2295 /**
2296  * batadv_tt_local_update_crc - update all the local CRCs
2297  * @bat_priv: the bat priv with all the soft interface information
2298  */
2299 static void batadv_tt_local_update_crc(struct batadv_priv *bat_priv)
2300 {
2301         struct batadv_softif_vlan *vlan;
2302
2303         /* recompute the global CRC for each VLAN */
2304         rcu_read_lock();
2305         hlist_for_each_entry_rcu(vlan, &bat_priv->softif_vlan_list, list) {
2306                 vlan->tt.crc = batadv_tt_local_crc(bat_priv, vlan->vid);
2307         }
2308         rcu_read_unlock();
2309 }
2310
2311 /**
2312  * batadv_tt_global_update_crc - update all the global CRCs for this orig_node
2313  * @bat_priv: the bat priv with all the soft interface information
2314  * @orig_node: the orig_node for which the CRCs have to be updated
2315  */
2316 static void batadv_tt_global_update_crc(struct batadv_priv *bat_priv,
2317                                         struct batadv_orig_node *orig_node)
2318 {
2319         struct batadv_orig_node_vlan *vlan;
2320         uint32_t crc;
2321
2322         /* recompute the global CRC for each VLAN */
2323         rcu_read_lock();
2324         list_for_each_entry_rcu(vlan, &orig_node->vlan_list, list) {
2325                 /* if orig_node is a backbone node for this VLAN, don't compute
2326                  * the CRC as we ignore all the global entries over it
2327                  */
2328                 if (batadv_bla_is_backbone_gw_orig(bat_priv, orig_node->orig,
2329                                                    vlan->vid))
2330                         continue;
2331
2332                 crc = batadv_tt_global_crc(bat_priv, orig_node, vlan->vid);
2333                 vlan->tt.crc = crc;
2334         }
2335         rcu_read_unlock();
2336 }
2337
2338 /**
2339  * batadv_send_tt_request - send a TT Request message to a given node
2340  * @bat_priv: the bat priv with all the soft interface information
2341  * @dst_orig_node: the destination of the message
2342  * @ttvn: the version number that the source of the message is looking for
2343  * @tt_vlan: pointer to the first tvlv VLAN object to request
2344  * @num_vlan: number of tvlv VLAN entries
2345  * @full_table: ask for the entire translation table if true, while only for the
2346  *  last TT diff otherwise
2347  */
2348 static int batadv_send_tt_request(struct batadv_priv *bat_priv,
2349                                   struct batadv_orig_node *dst_orig_node,
2350                                   uint8_t ttvn,
2351                                   struct batadv_tvlv_tt_vlan_data *tt_vlan,
2352                                   uint16_t num_vlan, bool full_table)
2353 {
2354         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2355         struct batadv_tt_req_node *tt_req_node = NULL;
2356         struct batadv_tvlv_tt_vlan_data *tt_vlan_req;
2357         struct batadv_hard_iface *primary_if;
2358         bool ret = false;
2359         int i, size;
2360
2361         primary_if = batadv_primary_if_get_selected(bat_priv);
2362         if (!primary_if)
2363                 goto out;
2364
2365         /* The new tt_req will be issued only if I'm not waiting for a
2366          * reply from the same orig_node yet
2367          */
2368         tt_req_node = batadv_new_tt_req_node(bat_priv, dst_orig_node);
2369         if (!tt_req_node)
2370                 goto out;
2371
2372         size = sizeof(*tvlv_tt_data) + sizeof(*tt_vlan_req) * num_vlan;
2373         tvlv_tt_data = kzalloc(size, GFP_ATOMIC);
2374         if (!tvlv_tt_data)
2375                 goto out;
2376
2377         tvlv_tt_data->flags = BATADV_TT_REQUEST;
2378         tvlv_tt_data->ttvn = ttvn;
2379         tvlv_tt_data->num_vlan = htons(num_vlan);
2380
2381         /* send all the CRCs within the request. This is needed by intermediate
2382          * nodes to ensure they have the correct table before replying
2383          */
2384         tt_vlan_req = (struct batadv_tvlv_tt_vlan_data *)(tvlv_tt_data + 1);
2385         for (i = 0; i < num_vlan; i++) {
2386                 tt_vlan_req->vid = tt_vlan->vid;
2387                 tt_vlan_req->crc = tt_vlan->crc;
2388
2389                 tt_vlan_req++;
2390                 tt_vlan++;
2391         }
2392
2393         if (full_table)
2394                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2395
2396         batadv_dbg(BATADV_DBG_TT, bat_priv, "Sending TT_REQUEST to %pM [%c]\n",
2397                    dst_orig_node->orig, full_table ? 'F' : '.');
2398
2399         batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_TX);
2400         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2401                                  dst_orig_node->orig, BATADV_TVLV_TT, 1,
2402                                  tvlv_tt_data, size);
2403         ret = true;
2404
2405 out:
2406         if (primary_if)
2407                 batadv_hardif_free_ref(primary_if);
2408         if (ret && tt_req_node) {
2409                 spin_lock_bh(&bat_priv->tt.req_list_lock);
2410                 list_del(&tt_req_node->list);
2411                 spin_unlock_bh(&bat_priv->tt.req_list_lock);
2412                 kfree(tt_req_node);
2413         }
2414         kfree(tvlv_tt_data);
2415         return ret;
2416 }
2417
2418 /**
2419  * batadv_send_other_tt_response - send reply to tt request concerning another
2420  *  node's translation table
2421  * @bat_priv: the bat priv with all the soft interface information
2422  * @tt_data: tt data containing the tt request information
2423  * @req_src: mac address of tt request sender
2424  * @req_dst: mac address of tt request recipient
2425  *
2426  * Returns true if tt request reply was sent, false otherwise.
2427  */
2428 static bool batadv_send_other_tt_response(struct batadv_priv *bat_priv,
2429                                           struct batadv_tvlv_tt_data *tt_data,
2430                                           uint8_t *req_src, uint8_t *req_dst)
2431 {
2432         struct batadv_orig_node *req_dst_orig_node;
2433         struct batadv_orig_node *res_dst_orig_node = NULL;
2434         struct batadv_tvlv_tt_change *tt_change;
2435         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2436         struct batadv_tvlv_tt_vlan_data *tt_vlan;
2437         bool ret = false, full_table;
2438         uint8_t orig_ttvn, req_ttvn;
2439         uint16_t tvlv_len;
2440         int32_t tt_len;
2441
2442         batadv_dbg(BATADV_DBG_TT, bat_priv,
2443                    "Received TT_REQUEST from %pM for ttvn: %u (%pM) [%c]\n",
2444                    req_src, tt_data->ttvn, req_dst,
2445                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2446
2447         /* Let's get the orig node of the REAL destination */
2448         req_dst_orig_node = batadv_orig_hash_find(bat_priv, req_dst);
2449         if (!req_dst_orig_node)
2450                 goto out;
2451
2452         res_dst_orig_node = batadv_orig_hash_find(bat_priv, req_src);
2453         if (!res_dst_orig_node)
2454                 goto out;
2455
2456         orig_ttvn = (uint8_t)atomic_read(&req_dst_orig_node->last_ttvn);
2457         req_ttvn = tt_data->ttvn;
2458
2459         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
2460         /* this node doesn't have the requested data */
2461         if (orig_ttvn != req_ttvn ||
2462             !batadv_tt_global_check_crc(req_dst_orig_node, tt_vlan,
2463                                         ntohs(tt_data->num_vlan)))
2464                 goto out;
2465
2466         /* If the full table has been explicitly requested */
2467         if (tt_data->flags & BATADV_TT_FULL_TABLE ||
2468             !req_dst_orig_node->tt_buff)
2469                 full_table = true;
2470         else
2471                 full_table = false;
2472
2473         /* TT fragmentation hasn't been implemented yet, so send as many
2474          * TT entries fit a single packet as possible only
2475          */
2476         if (!full_table) {
2477                 spin_lock_bh(&req_dst_orig_node->tt_buff_lock);
2478                 tt_len = req_dst_orig_node->tt_buff_len;
2479
2480                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2481                                                               &tvlv_tt_data,
2482                                                               &tt_change,
2483                                                               &tt_len);
2484                 if (!tt_len)
2485                         goto unlock;
2486
2487                 /* Copy the last orig_node's OGM buffer */
2488                 memcpy(tt_change, req_dst_orig_node->tt_buff,
2489                        req_dst_orig_node->tt_buff_len);
2490                 spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2491         } else {
2492                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2493                  * in the initial part
2494                  */
2495                 tt_len = -1;
2496                 tvlv_len = batadv_tt_prepare_tvlv_global_data(req_dst_orig_node,
2497                                                               &tvlv_tt_data,
2498                                                               &tt_change,
2499                                                               &tt_len);
2500                 if (!tt_len)
2501                         goto out;
2502
2503                 /* fill the rest of the tvlv with the real TT entries */
2504                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.global_hash,
2505                                         tt_change, tt_len,
2506                                         batadv_tt_global_valid,
2507                                         req_dst_orig_node);
2508         }
2509
2510         /* Don't send the response, if larger than fragmented packet. */
2511         tt_len = sizeof(struct batadv_unicast_tvlv_packet) + tvlv_len;
2512         if (tt_len > atomic_read(&bat_priv->packet_size_max)) {
2513                 net_ratelimited_function(batadv_info, bat_priv->soft_iface,
2514                                          "Ignoring TT_REQUEST from %pM; Response size exceeds max packet size.\n",
2515                                          res_dst_orig_node->orig);
2516                 goto out;
2517         }
2518
2519         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2520         tvlv_tt_data->ttvn = req_ttvn;
2521
2522         if (full_table)
2523                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2524
2525         batadv_dbg(BATADV_DBG_TT, bat_priv,
2526                    "Sending TT_RESPONSE %pM for %pM [%c] (ttvn: %u)\n",
2527                    res_dst_orig_node->orig, req_dst_orig_node->orig,
2528                    full_table ? 'F' : '.', req_ttvn);
2529
2530         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2531
2532         batadv_tvlv_unicast_send(bat_priv, req_dst_orig_node->orig,
2533                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2534                                  tvlv_len);
2535
2536         ret = true;
2537         goto out;
2538
2539 unlock:
2540         spin_unlock_bh(&req_dst_orig_node->tt_buff_lock);
2541
2542 out:
2543         if (res_dst_orig_node)
2544                 batadv_orig_node_free_ref(res_dst_orig_node);
2545         if (req_dst_orig_node)
2546                 batadv_orig_node_free_ref(req_dst_orig_node);
2547         kfree(tvlv_tt_data);
2548         return ret;
2549 }
2550
2551 /**
2552  * batadv_send_my_tt_response - send reply to tt request concerning this node's
2553  *  translation table
2554  * @bat_priv: the bat priv with all the soft interface information
2555  * @tt_data: tt data containing the tt request information
2556  * @req_src: mac address of tt request sender
2557  *
2558  * Returns true if tt request reply was sent, false otherwise.
2559  */
2560 static bool batadv_send_my_tt_response(struct batadv_priv *bat_priv,
2561                                        struct batadv_tvlv_tt_data *tt_data,
2562                                        uint8_t *req_src)
2563 {
2564         struct batadv_tvlv_tt_data *tvlv_tt_data = NULL;
2565         struct batadv_hard_iface *primary_if = NULL;
2566         struct batadv_tvlv_tt_change *tt_change;
2567         struct batadv_orig_node *orig_node;
2568         uint8_t my_ttvn, req_ttvn;
2569         uint16_t tvlv_len;
2570         bool full_table;
2571         int32_t tt_len;
2572
2573         batadv_dbg(BATADV_DBG_TT, bat_priv,
2574                    "Received TT_REQUEST from %pM for ttvn: %u (me) [%c]\n",
2575                    req_src, tt_data->ttvn,
2576                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2577
2578         spin_lock_bh(&bat_priv->tt.commit_lock);
2579
2580         my_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2581         req_ttvn = tt_data->ttvn;
2582
2583         orig_node = batadv_orig_hash_find(bat_priv, req_src);
2584         if (!orig_node)
2585                 goto out;
2586
2587         primary_if = batadv_primary_if_get_selected(bat_priv);
2588         if (!primary_if)
2589                 goto out;
2590
2591         /* If the full table has been explicitly requested or the gap
2592          * is too big send the whole local translation table
2593          */
2594         if (tt_data->flags & BATADV_TT_FULL_TABLE || my_ttvn != req_ttvn ||
2595             !bat_priv->tt.last_changeset)
2596                 full_table = true;
2597         else
2598                 full_table = false;
2599
2600         /* TT fragmentation hasn't been implemented yet, so send as many
2601          * TT entries fit a single packet as possible only
2602          */
2603         if (!full_table) {
2604                 spin_lock_bh(&bat_priv->tt.last_changeset_lock);
2605
2606                 tt_len = bat_priv->tt.last_changeset_len;
2607                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2608                                                              &tvlv_tt_data,
2609                                                              &tt_change,
2610                                                              &tt_len);
2611                 if (!tt_len)
2612                         goto unlock;
2613
2614                 /* Copy the last orig_node's OGM buffer */
2615                 memcpy(tt_change, bat_priv->tt.last_changeset,
2616                        bat_priv->tt.last_changeset_len);
2617                 spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2618         } else {
2619                 req_ttvn = (uint8_t)atomic_read(&bat_priv->tt.vn);
2620
2621                 /* allocate the tvlv, put the tt_data and all the tt_vlan_data
2622                  * in the initial part
2623                  */
2624                 tt_len = -1;
2625                 tvlv_len = batadv_tt_prepare_tvlv_local_data(bat_priv,
2626                                                              &tvlv_tt_data,
2627                                                              &tt_change,
2628                                                              &tt_len);
2629                 if (!tt_len)
2630                         goto out;
2631
2632                 /* fill the rest of the tvlv with the real TT entries */
2633                 batadv_tt_tvlv_generate(bat_priv, bat_priv->tt.local_hash,
2634                                         tt_change, tt_len,
2635                                         batadv_tt_local_valid, NULL);
2636         }
2637
2638         tvlv_tt_data->flags = BATADV_TT_RESPONSE;
2639         tvlv_tt_data->ttvn = req_ttvn;
2640
2641         if (full_table)
2642                 tvlv_tt_data->flags |= BATADV_TT_FULL_TABLE;
2643
2644         batadv_dbg(BATADV_DBG_TT, bat_priv,
2645                    "Sending TT_RESPONSE to %pM [%c] (ttvn: %u)\n",
2646                    orig_node->orig, full_table ? 'F' : '.', req_ttvn);
2647
2648         batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_TX);
2649
2650         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2651                                  req_src, BATADV_TVLV_TT, 1, tvlv_tt_data,
2652                                  tvlv_len);
2653
2654         goto out;
2655
2656 unlock:
2657         spin_unlock_bh(&bat_priv->tt.last_changeset_lock);
2658 out:
2659         spin_unlock_bh(&bat_priv->tt.commit_lock);
2660         if (orig_node)
2661                 batadv_orig_node_free_ref(orig_node);
2662         if (primary_if)
2663                 batadv_hardif_free_ref(primary_if);
2664         kfree(tvlv_tt_data);
2665         /* The packet was for this host, so it doesn't need to be re-routed */
2666         return true;
2667 }
2668
2669 /**
2670  * batadv_send_tt_response - send reply to tt request
2671  * @bat_priv: the bat priv with all the soft interface information
2672  * @tt_data: tt data containing the tt request information
2673  * @req_src: mac address of tt request sender
2674  * @req_dst: mac address of tt request recipient
2675  *
2676  * Returns true if tt request reply was sent, false otherwise.
2677  */
2678 static bool batadv_send_tt_response(struct batadv_priv *bat_priv,
2679                                     struct batadv_tvlv_tt_data *tt_data,
2680                                     uint8_t *req_src, uint8_t *req_dst)
2681 {
2682         if (batadv_is_my_mac(bat_priv, req_dst))
2683                 return batadv_send_my_tt_response(bat_priv, tt_data, req_src);
2684         else
2685                 return batadv_send_other_tt_response(bat_priv, tt_data,
2686                                                      req_src, req_dst);
2687 }
2688
2689 static void _batadv_tt_update_changes(struct batadv_priv *bat_priv,
2690                                       struct batadv_orig_node *orig_node,
2691                                       struct batadv_tvlv_tt_change *tt_change,
2692                                       uint16_t tt_num_changes, uint8_t ttvn)
2693 {
2694         int i;
2695         int roams;
2696
2697         for (i = 0; i < tt_num_changes; i++) {
2698                 if ((tt_change + i)->flags & BATADV_TT_CLIENT_DEL) {
2699                         roams = (tt_change + i)->flags & BATADV_TT_CLIENT_ROAM;
2700                         batadv_tt_global_del(bat_priv, orig_node,
2701                                              (tt_change + i)->addr,
2702                                              ntohs((tt_change + i)->vid),
2703                                              "tt removed by changes",
2704                                              roams);
2705                 } else {
2706                         if (!batadv_tt_global_add(bat_priv, orig_node,
2707                                                   (tt_change + i)->addr,
2708                                                   ntohs((tt_change + i)->vid),
2709                                                   (tt_change + i)->flags, ttvn))
2710                                 /* In case of problem while storing a
2711                                  * global_entry, we stop the updating
2712                                  * procedure without committing the
2713                                  * ttvn change. This will avoid to send
2714                                  * corrupted data on tt_request
2715                                  */
2716                                 return;
2717                 }
2718         }
2719         orig_node->tt_initialised = true;
2720 }
2721
2722 static void batadv_tt_fill_gtable(struct batadv_priv *bat_priv,
2723                                   struct batadv_tvlv_tt_change *tt_change,
2724                                   uint8_t ttvn, uint8_t *resp_src,
2725                                   uint16_t num_entries)
2726 {
2727         struct batadv_orig_node *orig_node;
2728
2729         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2730         if (!orig_node)
2731                 goto out;
2732
2733         /* Purge the old table first.. */
2734         batadv_tt_global_del_orig(bat_priv, orig_node, -1,
2735                                   "Received full table");
2736
2737         _batadv_tt_update_changes(bat_priv, orig_node, tt_change, num_entries,
2738                                   ttvn);
2739
2740         spin_lock_bh(&orig_node->tt_buff_lock);
2741         kfree(orig_node->tt_buff);
2742         orig_node->tt_buff_len = 0;
2743         orig_node->tt_buff = NULL;
2744         spin_unlock_bh(&orig_node->tt_buff_lock);
2745
2746         atomic_set(&orig_node->last_ttvn, ttvn);
2747
2748 out:
2749         if (orig_node)
2750                 batadv_orig_node_free_ref(orig_node);
2751 }
2752
2753 static void batadv_tt_update_changes(struct batadv_priv *bat_priv,
2754                                      struct batadv_orig_node *orig_node,
2755                                      uint16_t tt_num_changes, uint8_t ttvn,
2756                                      struct batadv_tvlv_tt_change *tt_change)
2757 {
2758         _batadv_tt_update_changes(bat_priv, orig_node, tt_change,
2759                                   tt_num_changes, ttvn);
2760
2761         batadv_tt_save_orig_buffer(bat_priv, orig_node, tt_change,
2762                                    batadv_tt_len(tt_num_changes));
2763         atomic_set(&orig_node->last_ttvn, ttvn);
2764 }
2765
2766 /**
2767  * batadv_is_my_client - check if a client is served by the local node
2768  * @bat_priv: the bat priv with all the soft interface information
2769  * @addr: the mac adress of the client to check
2770  * @vid: VLAN identifier
2771  *
2772  * Returns true if the client is served by this node, false otherwise.
2773  */
2774 bool batadv_is_my_client(struct batadv_priv *bat_priv, const uint8_t *addr,
2775                          unsigned short vid)
2776 {
2777         struct batadv_tt_local_entry *tt_local_entry;
2778         bool ret = false;
2779
2780         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
2781         if (!tt_local_entry)
2782                 goto out;
2783         /* Check if the client has been logically deleted (but is kept for
2784          * consistency purpose)
2785          */
2786         if ((tt_local_entry->common.flags & BATADV_TT_CLIENT_PENDING) ||
2787             (tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM))
2788                 goto out;
2789         ret = true;
2790 out:
2791         if (tt_local_entry)
2792                 batadv_tt_local_entry_free_ref(tt_local_entry);
2793         return ret;
2794 }
2795
2796 /**
2797  * batadv_handle_tt_response - process incoming tt reply
2798  * @bat_priv: the bat priv with all the soft interface information
2799  * @tt_data: tt data containing the tt request information
2800  * @resp_src: mac address of tt reply sender
2801  * @num_entries: number of tt change entries appended to the tt data
2802  */
2803 static void batadv_handle_tt_response(struct batadv_priv *bat_priv,
2804                                       struct batadv_tvlv_tt_data *tt_data,
2805                                       uint8_t *resp_src, uint16_t num_entries)
2806 {
2807         struct batadv_tt_req_node *node, *safe;
2808         struct batadv_orig_node *orig_node = NULL;
2809         struct batadv_tvlv_tt_change *tt_change;
2810         uint8_t *tvlv_ptr = (uint8_t *)tt_data;
2811         uint16_t change_offset;
2812
2813         batadv_dbg(BATADV_DBG_TT, bat_priv,
2814                    "Received TT_RESPONSE from %pM for ttvn %d t_size: %d [%c]\n",
2815                    resp_src, tt_data->ttvn, num_entries,
2816                    (tt_data->flags & BATADV_TT_FULL_TABLE ? 'F' : '.'));
2817
2818         orig_node = batadv_orig_hash_find(bat_priv, resp_src);
2819         if (!orig_node)
2820                 goto out;
2821
2822         spin_lock_bh(&orig_node->tt_lock);
2823
2824         change_offset = sizeof(struct batadv_tvlv_tt_vlan_data);
2825         change_offset *= ntohs(tt_data->num_vlan);
2826         change_offset += sizeof(*tt_data);
2827         tvlv_ptr += change_offset;
2828
2829         tt_change = (struct batadv_tvlv_tt_change *)tvlv_ptr;
2830         if (tt_data->flags & BATADV_TT_FULL_TABLE) {
2831                 batadv_tt_fill_gtable(bat_priv, tt_change, tt_data->ttvn,
2832                                       resp_src, num_entries);
2833         } else {
2834                 batadv_tt_update_changes(bat_priv, orig_node, num_entries,
2835                                          tt_data->ttvn, tt_change);
2836         }
2837
2838         /* Recalculate the CRC for this orig_node and store it */
2839         batadv_tt_global_update_crc(bat_priv, orig_node);
2840
2841         spin_unlock_bh(&orig_node->tt_lock);
2842
2843         /* Delete the tt_req_node from pending tt_requests list */
2844         spin_lock_bh(&bat_priv->tt.req_list_lock);
2845         list_for_each_entry_safe(node, safe, &bat_priv->tt.req_list, list) {
2846                 if (!batadv_compare_eth(node->addr, resp_src))
2847                         continue;
2848                 list_del(&node->list);
2849                 kfree(node);
2850         }
2851
2852         spin_unlock_bh(&bat_priv->tt.req_list_lock);
2853 out:
2854         if (orig_node)
2855                 batadv_orig_node_free_ref(orig_node);
2856 }
2857
2858 static void batadv_tt_roam_list_free(struct batadv_priv *bat_priv)
2859 {
2860         struct batadv_tt_roam_node *node, *safe;
2861
2862         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2863
2864         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2865                 list_del(&node->list);
2866                 kfree(node);
2867         }
2868
2869         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2870 }
2871
2872 static void batadv_tt_roam_purge(struct batadv_priv *bat_priv)
2873 {
2874         struct batadv_tt_roam_node *node, *safe;
2875
2876         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2877         list_for_each_entry_safe(node, safe, &bat_priv->tt.roam_list, list) {
2878                 if (!batadv_has_timed_out(node->first_time,
2879                                           BATADV_ROAMING_MAX_TIME))
2880                         continue;
2881
2882                 list_del(&node->list);
2883                 kfree(node);
2884         }
2885         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2886 }
2887
2888 /* This function checks whether the client already reached the
2889  * maximum number of possible roaming phases. In this case the ROAMING_ADV
2890  * will not be sent.
2891  *
2892  * returns true if the ROAMING_ADV can be sent, false otherwise
2893  */
2894 static bool batadv_tt_check_roam_count(struct batadv_priv *bat_priv,
2895                                        uint8_t *client)
2896 {
2897         struct batadv_tt_roam_node *tt_roam_node;
2898         bool ret = false;
2899
2900         spin_lock_bh(&bat_priv->tt.roam_list_lock);
2901         /* The new tt_req will be issued only if I'm not waiting for a
2902          * reply from the same orig_node yet
2903          */
2904         list_for_each_entry(tt_roam_node, &bat_priv->tt.roam_list, list) {
2905                 if (!batadv_compare_eth(tt_roam_node->addr, client))
2906                         continue;
2907
2908                 if (batadv_has_timed_out(tt_roam_node->first_time,
2909                                          BATADV_ROAMING_MAX_TIME))
2910                         continue;
2911
2912                 if (!batadv_atomic_dec_not_zero(&tt_roam_node->counter))
2913                         /* Sorry, you roamed too many times! */
2914                         goto unlock;
2915                 ret = true;
2916                 break;
2917         }
2918
2919         if (!ret) {
2920                 tt_roam_node = kmalloc(sizeof(*tt_roam_node), GFP_ATOMIC);
2921                 if (!tt_roam_node)
2922                         goto unlock;
2923
2924                 tt_roam_node->first_time = jiffies;
2925                 atomic_set(&tt_roam_node->counter,
2926                            BATADV_ROAMING_MAX_COUNT - 1);
2927                 memcpy(tt_roam_node->addr, client, ETH_ALEN);
2928
2929                 list_add(&tt_roam_node->list, &bat_priv->tt.roam_list);
2930                 ret = true;
2931         }
2932
2933 unlock:
2934         spin_unlock_bh(&bat_priv->tt.roam_list_lock);
2935         return ret;
2936 }
2937
2938 /**
2939  * batadv_send_roam_adv - send a roaming advertisement message
2940  * @bat_priv: the bat priv with all the soft interface information
2941  * @client: mac address of the roaming client
2942  * @vid: VLAN identifier
2943  * @orig_node: message destination
2944  *
2945  * Send a ROAMING_ADV message to the node which was previously serving this
2946  * client. This is done to inform the node that from now on all traffic destined
2947  * for this particular roamed client has to be forwarded to the sender of the
2948  * roaming message.
2949  */
2950 static void batadv_send_roam_adv(struct batadv_priv *bat_priv, uint8_t *client,
2951                                  unsigned short vid,
2952                                  struct batadv_orig_node *orig_node)
2953 {
2954         struct batadv_hard_iface *primary_if;
2955         struct batadv_tvlv_roam_adv tvlv_roam;
2956
2957         primary_if = batadv_primary_if_get_selected(bat_priv);
2958         if (!primary_if)
2959                 goto out;
2960
2961         /* before going on we have to check whether the client has
2962          * already roamed to us too many times
2963          */
2964         if (!batadv_tt_check_roam_count(bat_priv, client))
2965                 goto out;
2966
2967         batadv_dbg(BATADV_DBG_TT, bat_priv,
2968                    "Sending ROAMING_ADV to %pM (client %pM, vid: %d)\n",
2969                    orig_node->orig, client, BATADV_PRINT_VID(vid));
2970
2971         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_TX);
2972
2973         memcpy(tvlv_roam.client, client, sizeof(tvlv_roam.client));
2974         tvlv_roam.vid = htons(vid);
2975
2976         batadv_tvlv_unicast_send(bat_priv, primary_if->net_dev->dev_addr,
2977                                  orig_node->orig, BATADV_TVLV_ROAM, 1,
2978                                  &tvlv_roam, sizeof(tvlv_roam));
2979
2980 out:
2981         if (primary_if)
2982                 batadv_hardif_free_ref(primary_if);
2983 }
2984
2985 static void batadv_tt_purge(struct work_struct *work)
2986 {
2987         struct delayed_work *delayed_work;
2988         struct batadv_priv_tt *priv_tt;
2989         struct batadv_priv *bat_priv;
2990
2991         delayed_work = container_of(work, struct delayed_work, work);
2992         priv_tt = container_of(delayed_work, struct batadv_priv_tt, work);
2993         bat_priv = container_of(priv_tt, struct batadv_priv, tt);
2994
2995         batadv_tt_local_purge(bat_priv, BATADV_TT_LOCAL_TIMEOUT);
2996         batadv_tt_global_purge(bat_priv);
2997         batadv_tt_req_purge(bat_priv);
2998         batadv_tt_roam_purge(bat_priv);
2999
3000         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3001                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3002 }
3003
3004 void batadv_tt_free(struct batadv_priv *bat_priv)
3005 {
3006         batadv_tvlv_container_unregister(bat_priv, BATADV_TVLV_TT, 1);
3007         batadv_tvlv_handler_unregister(bat_priv, BATADV_TVLV_TT, 1);
3008
3009         cancel_delayed_work_sync(&bat_priv->tt.work);
3010
3011         batadv_tt_local_table_free(bat_priv);
3012         batadv_tt_global_table_free(bat_priv);
3013         batadv_tt_req_list_free(bat_priv);
3014         batadv_tt_changes_list_free(bat_priv);
3015         batadv_tt_roam_list_free(bat_priv);
3016
3017         kfree(bat_priv->tt.last_changeset);
3018 }
3019
3020 /**
3021  * batadv_tt_local_set_flags - set or unset the specified flags on the local
3022  *  table and possibly count them in the TT size
3023  * @bat_priv: the bat priv with all the soft interface information
3024  * @flags: the flag to switch
3025  * @enable: whether to set or unset the flag
3026  * @count: whether to increase the TT size by the number of changed entries
3027  */
3028 static void batadv_tt_local_set_flags(struct batadv_priv *bat_priv,
3029                                       uint16_t flags, bool enable, bool count)
3030 {
3031         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3032         struct batadv_tt_common_entry *tt_common_entry;
3033         uint16_t changed_num = 0;
3034         struct hlist_head *head;
3035         uint32_t i;
3036
3037         if (!hash)
3038                 return;
3039
3040         for (i = 0; i < hash->size; i++) {
3041                 head = &hash->table[i];
3042
3043                 rcu_read_lock();
3044                 hlist_for_each_entry_rcu(tt_common_entry,
3045                                          head, hash_entry) {
3046                         if (enable) {
3047                                 if ((tt_common_entry->flags & flags) == flags)
3048                                         continue;
3049                                 tt_common_entry->flags |= flags;
3050                         } else {
3051                                 if (!(tt_common_entry->flags & flags))
3052                                         continue;
3053                                 tt_common_entry->flags &= ~flags;
3054                         }
3055                         changed_num++;
3056
3057                         if (!count)
3058                                 continue;
3059
3060                         batadv_tt_local_size_inc(bat_priv,
3061                                                  tt_common_entry->vid);
3062                 }
3063                 rcu_read_unlock();
3064         }
3065 }
3066
3067 /* Purge out all the tt local entries marked with BATADV_TT_CLIENT_PENDING */
3068 static void batadv_tt_local_purge_pending_clients(struct batadv_priv *bat_priv)
3069 {
3070         struct batadv_hashtable *hash = bat_priv->tt.local_hash;
3071         struct batadv_tt_common_entry *tt_common;
3072         struct batadv_tt_local_entry *tt_local;
3073         struct hlist_node *node_tmp;
3074         struct hlist_head *head;
3075         spinlock_t *list_lock; /* protects write access to the hash lists */
3076         uint32_t i;
3077
3078         if (!hash)
3079                 return;
3080
3081         for (i = 0; i < hash->size; i++) {
3082                 head = &hash->table[i];
3083                 list_lock = &hash->list_locks[i];
3084
3085                 spin_lock_bh(list_lock);
3086                 hlist_for_each_entry_safe(tt_common, node_tmp, head,
3087                                           hash_entry) {
3088                         if (!(tt_common->flags & BATADV_TT_CLIENT_PENDING))
3089                                 continue;
3090
3091                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3092                                    "Deleting local tt entry (%pM, vid: %d): pending\n",
3093                                    tt_common->addr,
3094                                    BATADV_PRINT_VID(tt_common->vid));
3095
3096                         batadv_tt_local_size_dec(bat_priv, tt_common->vid);
3097                         hlist_del_rcu(&tt_common->hash_entry);
3098                         tt_local = container_of(tt_common,
3099                                                 struct batadv_tt_local_entry,
3100                                                 common);
3101                         batadv_tt_local_entry_free_ref(tt_local);
3102                 }
3103                 spin_unlock_bh(list_lock);
3104         }
3105 }
3106
3107 /**
3108  * batadv_tt_local_commit_changes_nolock - commit all pending local tt changes
3109  *  which have been queued in the time since the last commit
3110  * @bat_priv: the bat priv with all the soft interface information
3111  *
3112  * Caller must hold tt->commit_lock.
3113  */
3114 static void batadv_tt_local_commit_changes_nolock(struct batadv_priv *bat_priv)
3115 {
3116         if (atomic_read(&bat_priv->tt.local_changes) < 1) {
3117                 if (!batadv_atomic_dec_not_zero(&bat_priv->tt.ogm_append_cnt))
3118                         batadv_tt_tvlv_container_update(bat_priv);
3119                 return;
3120         }
3121
3122         batadv_tt_local_set_flags(bat_priv, BATADV_TT_CLIENT_NEW, false, true);
3123
3124         batadv_tt_local_purge_pending_clients(bat_priv);
3125         batadv_tt_local_update_crc(bat_priv);
3126
3127         /* Increment the TTVN only once per OGM interval */
3128         atomic_inc(&bat_priv->tt.vn);
3129         batadv_dbg(BATADV_DBG_TT, bat_priv,
3130                    "Local changes committed, updating to ttvn %u\n",
3131                    (uint8_t)atomic_read(&bat_priv->tt.vn));
3132
3133         /* reset the sending counter */
3134         atomic_set(&bat_priv->tt.ogm_append_cnt, BATADV_TT_OGM_APPEND_MAX);
3135         batadv_tt_tvlv_container_update(bat_priv);
3136 }
3137
3138 /**
3139  * batadv_tt_local_commit_changes - commit all pending local tt changes which
3140  *  have been queued in the time since the last commit
3141  * @bat_priv: the bat priv with all the soft interface information
3142  */
3143 void batadv_tt_local_commit_changes(struct batadv_priv *bat_priv)
3144 {
3145         spin_lock_bh(&bat_priv->tt.commit_lock);
3146         batadv_tt_local_commit_changes_nolock(bat_priv);
3147         spin_unlock_bh(&bat_priv->tt.commit_lock);
3148 }
3149
3150 bool batadv_is_ap_isolated(struct batadv_priv *bat_priv, uint8_t *src,
3151                            uint8_t *dst, unsigned short vid)
3152 {
3153         struct batadv_tt_local_entry *tt_local_entry = NULL;
3154         struct batadv_tt_global_entry *tt_global_entry = NULL;
3155         struct batadv_softif_vlan *vlan;
3156         bool ret = false;
3157
3158         vlan = batadv_softif_vlan_get(bat_priv, vid);
3159         if (!vlan || !atomic_read(&vlan->ap_isolation))
3160                 goto out;
3161
3162         tt_local_entry = batadv_tt_local_hash_find(bat_priv, dst, vid);
3163         if (!tt_local_entry)
3164                 goto out;
3165
3166         tt_global_entry = batadv_tt_global_hash_find(bat_priv, src, vid);
3167         if (!tt_global_entry)
3168                 goto out;
3169
3170         if (!_batadv_is_ap_isolated(tt_local_entry, tt_global_entry))
3171                 goto out;
3172
3173         ret = true;
3174
3175 out:
3176         if (vlan)
3177                 batadv_softif_vlan_free_ref(vlan);
3178         if (tt_global_entry)
3179                 batadv_tt_global_entry_free_ref(tt_global_entry);
3180         if (tt_local_entry)
3181                 batadv_tt_local_entry_free_ref(tt_local_entry);
3182         return ret;
3183 }
3184
3185 /**
3186  * batadv_tt_update_orig - update global translation table with new tt
3187  *  information received via ogms
3188  * @bat_priv: the bat priv with all the soft interface information
3189  * @orig: the orig_node of the ogm
3190  * @tt_vlan: pointer to the first tvlv VLAN entry
3191  * @tt_num_vlan: number of tvlv VLAN entries
3192  * @tt_change: pointer to the first entry in the TT buffer
3193  * @tt_num_changes: number of tt changes inside the tt buffer
3194  * @ttvn: translation table version number of this changeset
3195  * @tt_crc: crc32 checksum of orig node's translation table
3196  */
3197 static void batadv_tt_update_orig(struct batadv_priv *bat_priv,
3198                                   struct batadv_orig_node *orig_node,
3199                                   const void *tt_buff, uint16_t tt_num_vlan,
3200                                   struct batadv_tvlv_tt_change *tt_change,
3201                                   uint16_t tt_num_changes, uint8_t ttvn)
3202 {
3203         uint8_t orig_ttvn = (uint8_t)atomic_read(&orig_node->last_ttvn);
3204         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3205         bool full_table = true;
3206
3207         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)tt_buff;
3208         /* orig table not initialised AND first diff is in the OGM OR the ttvn
3209          * increased by one -> we can apply the attached changes
3210          */
3211         if ((!orig_node->tt_initialised && ttvn == 1) ||
3212             ttvn - orig_ttvn == 1) {
3213                 /* the OGM could not contain the changes due to their size or
3214                  * because they have already been sent BATADV_TT_OGM_APPEND_MAX
3215                  * times.
3216                  * In this case send a tt request
3217                  */
3218                 if (!tt_num_changes) {
3219                         full_table = false;
3220                         goto request_table;
3221                 }
3222
3223                 spin_lock_bh(&orig_node->tt_lock);
3224
3225                 batadv_tt_update_changes(bat_priv, orig_node, tt_num_changes,
3226                                          ttvn, tt_change);
3227
3228                 /* Even if we received the precomputed crc with the OGM, we
3229                  * prefer to recompute it to spot any possible inconsistency
3230                  * in the global table
3231                  */
3232                 batadv_tt_global_update_crc(bat_priv, orig_node);
3233
3234                 spin_unlock_bh(&orig_node->tt_lock);
3235
3236                 /* The ttvn alone is not enough to guarantee consistency
3237                  * because a single value could represent different states
3238                  * (due to the wrap around). Thus a node has to check whether
3239                  * the resulting table (after applying the changes) is still
3240                  * consistent or not. E.g. a node could disconnect while its
3241                  * ttvn is X and reconnect on ttvn = X + TTVN_MAX: in this case
3242                  * checking the CRC value is mandatory to detect the
3243                  * inconsistency
3244                  */
3245                 if (!batadv_tt_global_check_crc(orig_node, tt_vlan,
3246                                                 tt_num_vlan))
3247                         goto request_table;
3248         } else {
3249                 /* if we missed more than one change or our tables are not
3250                  * in sync anymore -> request fresh tt data
3251                  */
3252                 if (!orig_node->tt_initialised || ttvn != orig_ttvn ||
3253                     !batadv_tt_global_check_crc(orig_node, tt_vlan,
3254                                                 tt_num_vlan)) {
3255 request_table:
3256                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3257                                    "TT inconsistency for %pM. Need to retrieve the correct information (ttvn: %u last_ttvn: %u num_changes: %u)\n",
3258                                    orig_node->orig, ttvn, orig_ttvn,
3259                                    tt_num_changes);
3260                         batadv_send_tt_request(bat_priv, orig_node, ttvn,
3261                                                tt_vlan, tt_num_vlan,
3262                                                full_table);
3263                         return;
3264                 }
3265         }
3266 }
3267
3268 /**
3269  * batadv_tt_global_client_is_roaming - check if a client is marked as roaming
3270  * @bat_priv: the bat priv with all the soft interface information
3271  * @addr: the mac address of the client to check
3272  * @vid: VLAN identifier
3273  *
3274  * Returns true if we know that the client has moved from its old originator
3275  * to another one. This entry is still kept for consistency purposes and will be
3276  * deleted later by a DEL or because of timeout
3277  */
3278 bool batadv_tt_global_client_is_roaming(struct batadv_priv *bat_priv,
3279                                         uint8_t *addr, unsigned short vid)
3280 {
3281         struct batadv_tt_global_entry *tt_global_entry;
3282         bool ret = false;
3283
3284         tt_global_entry = batadv_tt_global_hash_find(bat_priv, addr, vid);
3285         if (!tt_global_entry)
3286                 goto out;
3287
3288         ret = tt_global_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3289         batadv_tt_global_entry_free_ref(tt_global_entry);
3290 out:
3291         return ret;
3292 }
3293
3294 /**
3295  * batadv_tt_local_client_is_roaming - tells whether the client is roaming
3296  * @bat_priv: the bat priv with all the soft interface information
3297  * @addr: the mac address of the local client to query
3298  * @vid: VLAN identifier
3299  *
3300  * Returns true if the local client is known to be roaming (it is not served by
3301  * this node anymore) or not. If yes, the client is still present in the table
3302  * to keep the latter consistent with the node TTVN
3303  */
3304 bool batadv_tt_local_client_is_roaming(struct batadv_priv *bat_priv,
3305                                        uint8_t *addr, unsigned short vid)
3306 {
3307         struct batadv_tt_local_entry *tt_local_entry;
3308         bool ret = false;
3309
3310         tt_local_entry = batadv_tt_local_hash_find(bat_priv, addr, vid);
3311         if (!tt_local_entry)
3312                 goto out;
3313
3314         ret = tt_local_entry->common.flags & BATADV_TT_CLIENT_ROAM;
3315         batadv_tt_local_entry_free_ref(tt_local_entry);
3316 out:
3317         return ret;
3318 }
3319
3320 bool batadv_tt_add_temporary_global_entry(struct batadv_priv *bat_priv,
3321                                           struct batadv_orig_node *orig_node,
3322                                           const unsigned char *addr,
3323                                           unsigned short vid)
3324 {
3325         bool ret = false;
3326
3327         if (!batadv_tt_global_add(bat_priv, orig_node, addr, vid,
3328                                   BATADV_TT_CLIENT_TEMP,
3329                                   atomic_read(&orig_node->last_ttvn)))
3330                 goto out;
3331
3332         batadv_dbg(BATADV_DBG_TT, bat_priv,
3333                    "Added temporary global client (addr: %pM, vid: %d, orig: %pM)\n",
3334                    addr, BATADV_PRINT_VID(vid), orig_node->orig);
3335         ret = true;
3336 out:
3337         return ret;
3338 }
3339
3340 /**
3341  * batadv_tt_local_resize_to_mtu - resize the local translation table fit the
3342  *  maximum packet size that can be transported through the mesh
3343  * @soft_iface: netdev struct of the mesh interface
3344  *
3345  * Remove entries older than 'timeout' and half timeout if more entries need
3346  * to be removed.
3347  */
3348 void batadv_tt_local_resize_to_mtu(struct net_device *soft_iface)
3349 {
3350         struct batadv_priv *bat_priv = netdev_priv(soft_iface);
3351         int packet_size_max = atomic_read(&bat_priv->packet_size_max);
3352         int table_size, timeout = BATADV_TT_LOCAL_TIMEOUT / 2;
3353         bool reduced = false;
3354
3355         spin_lock_bh(&bat_priv->tt.commit_lock);
3356
3357         while (true) {
3358                 table_size = batadv_tt_local_table_transmit_size(bat_priv);
3359                 if (packet_size_max >= table_size)
3360                         break;
3361
3362                 batadv_tt_local_purge(bat_priv, timeout);
3363                 batadv_tt_local_purge_pending_clients(bat_priv);
3364
3365                 timeout /= 2;
3366                 reduced = true;
3367                 net_ratelimited_function(batadv_info, soft_iface,
3368                                          "Forced to purge local tt entries to fit new maximum fragment MTU (%i)\n",
3369                                          packet_size_max);
3370         }
3371
3372         /* commit these changes immediately, to avoid synchronization problem
3373          * with the TTVN
3374          */
3375         if (reduced)
3376                 batadv_tt_local_commit_changes_nolock(bat_priv);
3377
3378         spin_unlock_bh(&bat_priv->tt.commit_lock);
3379 }
3380
3381 /**
3382  * batadv_tt_tvlv_ogm_handler_v1 - process incoming tt tvlv container
3383  * @bat_priv: the bat priv with all the soft interface information
3384  * @orig: the orig_node of the ogm
3385  * @flags: flags indicating the tvlv state (see batadv_tvlv_handler_flags)
3386  * @tvlv_value: tvlv buffer containing the gateway data
3387  * @tvlv_value_len: tvlv buffer length
3388  */
3389 static void batadv_tt_tvlv_ogm_handler_v1(struct batadv_priv *bat_priv,
3390                                           struct batadv_orig_node *orig,
3391                                           uint8_t flags, void *tvlv_value,
3392                                           uint16_t tvlv_value_len)
3393 {
3394         struct batadv_tvlv_tt_vlan_data *tt_vlan;
3395         struct batadv_tvlv_tt_change *tt_change;
3396         struct batadv_tvlv_tt_data *tt_data;
3397         uint16_t num_entries, num_vlan;
3398
3399         if (tvlv_value_len < sizeof(*tt_data))
3400                 return;
3401
3402         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3403         tvlv_value_len -= sizeof(*tt_data);
3404
3405         num_vlan = ntohs(tt_data->num_vlan);
3406
3407         if (tvlv_value_len < sizeof(*tt_vlan) * num_vlan)
3408                 return;
3409
3410         tt_vlan = (struct batadv_tvlv_tt_vlan_data *)(tt_data + 1);
3411         tt_change = (struct batadv_tvlv_tt_change *)(tt_vlan + num_vlan);
3412         tvlv_value_len -= sizeof(*tt_vlan) * num_vlan;
3413
3414         num_entries = batadv_tt_entries(tvlv_value_len);
3415
3416         batadv_tt_update_orig(bat_priv, orig, tt_vlan, num_vlan, tt_change,
3417                               num_entries, tt_data->ttvn);
3418 }
3419
3420 /**
3421  * batadv_tt_tvlv_unicast_handler_v1 - process incoming (unicast) tt tvlv
3422  *  container
3423  * @bat_priv: the bat priv with all the soft interface information
3424  * @src: mac address of tt tvlv sender
3425  * @dst: mac address of tt tvlv recipient
3426  * @tvlv_value: tvlv buffer containing the tt data
3427  * @tvlv_value_len: tvlv buffer length
3428  *
3429  * Returns NET_RX_DROP if the tt tvlv is to be re-routed, NET_RX_SUCCESS
3430  * otherwise.
3431  */
3432 static int batadv_tt_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3433                                              uint8_t *src, uint8_t *dst,
3434                                              void *tvlv_value,
3435                                              uint16_t tvlv_value_len)
3436 {
3437         struct batadv_tvlv_tt_data *tt_data;
3438         uint16_t tt_vlan_len, tt_num_entries;
3439         char tt_flag;
3440         bool ret;
3441
3442         if (tvlv_value_len < sizeof(*tt_data))
3443                 return NET_RX_SUCCESS;
3444
3445         tt_data = (struct batadv_tvlv_tt_data *)tvlv_value;
3446         tvlv_value_len -= sizeof(*tt_data);
3447
3448         tt_vlan_len = sizeof(struct batadv_tvlv_tt_vlan_data);
3449         tt_vlan_len *= ntohs(tt_data->num_vlan);
3450
3451         if (tvlv_value_len < tt_vlan_len)
3452                 return NET_RX_SUCCESS;
3453
3454         tvlv_value_len -= tt_vlan_len;
3455         tt_num_entries = batadv_tt_entries(tvlv_value_len);
3456
3457         switch (tt_data->flags & BATADV_TT_DATA_TYPE_MASK) {
3458         case BATADV_TT_REQUEST:
3459                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_REQUEST_RX);
3460
3461                 /* If this node cannot provide a TT response the tt_request is
3462                  * forwarded
3463                  */
3464                 ret = batadv_send_tt_response(bat_priv, tt_data, src, dst);
3465                 if (!ret) {
3466                         if (tt_data->flags & BATADV_TT_FULL_TABLE)
3467                                 tt_flag = 'F';
3468                         else
3469                                 tt_flag = '.';
3470
3471                         batadv_dbg(BATADV_DBG_TT, bat_priv,
3472                                    "Routing TT_REQUEST to %pM [%c]\n",
3473                                    dst, tt_flag);
3474                         /* tvlv API will re-route the packet */
3475                         return NET_RX_DROP;
3476                 }
3477                 break;
3478         case BATADV_TT_RESPONSE:
3479                 batadv_inc_counter(bat_priv, BATADV_CNT_TT_RESPONSE_RX);
3480
3481                 if (batadv_is_my_mac(bat_priv, dst)) {
3482                         batadv_handle_tt_response(bat_priv, tt_data,
3483                                                   src, tt_num_entries);
3484                         return NET_RX_SUCCESS;
3485                 }
3486
3487                 if (tt_data->flags & BATADV_TT_FULL_TABLE)
3488                         tt_flag =  'F';
3489                 else
3490                         tt_flag = '.';
3491
3492                 batadv_dbg(BATADV_DBG_TT, bat_priv,
3493                            "Routing TT_RESPONSE to %pM [%c]\n", dst, tt_flag);
3494
3495                 /* tvlv API will re-route the packet */
3496                 return NET_RX_DROP;
3497         }
3498
3499         return NET_RX_SUCCESS;
3500 }
3501
3502 /**
3503  * batadv_roam_tvlv_unicast_handler_v1 - process incoming tt roam tvlv container
3504  * @bat_priv: the bat priv with all the soft interface information
3505  * @src: mac address of tt tvlv sender
3506  * @dst: mac address of tt tvlv recipient
3507  * @tvlv_value: tvlv buffer containing the tt data
3508  * @tvlv_value_len: tvlv buffer length
3509  *
3510  * Returns NET_RX_DROP if the tt roam tvlv is to be re-routed, NET_RX_SUCCESS
3511  * otherwise.
3512  */
3513 static int batadv_roam_tvlv_unicast_handler_v1(struct batadv_priv *bat_priv,
3514                                                uint8_t *src, uint8_t *dst,
3515                                                void *tvlv_value,
3516                                                uint16_t tvlv_value_len)
3517 {
3518         struct batadv_tvlv_roam_adv *roaming_adv;
3519         struct batadv_orig_node *orig_node = NULL;
3520
3521         /* If this node is not the intended recipient of the
3522          * roaming advertisement the packet is forwarded
3523          * (the tvlv API will re-route the packet).
3524          */
3525         if (!batadv_is_my_mac(bat_priv, dst))
3526                 return NET_RX_DROP;
3527
3528         if (tvlv_value_len < sizeof(*roaming_adv))
3529                 goto out;
3530
3531         orig_node = batadv_orig_hash_find(bat_priv, src);
3532         if (!orig_node)
3533                 goto out;
3534
3535         batadv_inc_counter(bat_priv, BATADV_CNT_TT_ROAM_ADV_RX);
3536         roaming_adv = (struct batadv_tvlv_roam_adv *)tvlv_value;
3537
3538         batadv_dbg(BATADV_DBG_TT, bat_priv,
3539                    "Received ROAMING_ADV from %pM (client %pM)\n",
3540                    src, roaming_adv->client);
3541
3542         batadv_tt_global_add(bat_priv, orig_node, roaming_adv->client,
3543                              ntohs(roaming_adv->vid), BATADV_TT_CLIENT_ROAM,
3544                              atomic_read(&orig_node->last_ttvn) + 1);
3545
3546 out:
3547         if (orig_node)
3548                 batadv_orig_node_free_ref(orig_node);
3549         return NET_RX_SUCCESS;
3550 }
3551
3552 /**
3553  * batadv_tt_init - initialise the translation table internals
3554  * @bat_priv: the bat priv with all the soft interface information
3555  *
3556  * Return 0 on success or negative error number in case of failure.
3557  */
3558 int batadv_tt_init(struct batadv_priv *bat_priv)
3559 {
3560         int ret;
3561
3562         /* synchronized flags must be remote */
3563         BUILD_BUG_ON(!(BATADV_TT_SYNC_MASK & BATADV_TT_REMOTE_MASK));
3564
3565         ret = batadv_tt_local_init(bat_priv);
3566         if (ret < 0)
3567                 return ret;
3568
3569         ret = batadv_tt_global_init(bat_priv);
3570         if (ret < 0)
3571                 return ret;
3572
3573         batadv_tvlv_handler_register(bat_priv, batadv_tt_tvlv_ogm_handler_v1,
3574                                      batadv_tt_tvlv_unicast_handler_v1,
3575                                      BATADV_TVLV_TT, 1, BATADV_NO_FLAGS);
3576
3577         batadv_tvlv_handler_register(bat_priv, NULL,
3578                                      batadv_roam_tvlv_unicast_handler_v1,
3579                                      BATADV_TVLV_ROAM, 1, BATADV_NO_FLAGS);
3580
3581         INIT_DELAYED_WORK(&bat_priv->tt.work, batadv_tt_purge);
3582         queue_delayed_work(batadv_event_workqueue, &bat_priv->tt.work,
3583                            msecs_to_jiffies(BATADV_TT_WORK_PERIOD));
3584
3585         return 1;
3586 }
3587
3588 /**
3589  * batadv_tt_global_is_isolated - check if a client is marked as isolated
3590  * @bat_priv: the bat priv with all the soft interface information
3591  * @addr: the mac address of the client
3592  * @vid: the identifier of the VLAN where this client is connected
3593  *
3594  * Returns true if the client is marked with the TT_CLIENT_ISOLA flag, false
3595  * otherwise
3596  */
3597 bool batadv_tt_global_is_isolated(struct batadv_priv *bat_priv,
3598                                   const uint8_t *addr, unsigned short vid)
3599 {
3600         struct batadv_tt_global_entry *tt;
3601         bool ret;
3602
3603         tt = batadv_tt_global_hash_find(bat_priv, addr, vid);
3604         if (!tt)
3605                 return false;
3606
3607         ret = tt->common.flags & BATADV_TT_CLIENT_ISOLA;
3608
3609         batadv_tt_global_entry_free_ref(tt);
3610
3611         return ret;
3612 }